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Reach out to Volusion...I suspect they'll have all that data since it has only been 10 days.  It will cost you but at least you could prove your theory.

In my opinion, no.  Moving to another platform puts you another iteration away from the original solution.  If you do move and things don't get better then what?  You'll have double the 301's to address.

My recommendation would be to restore your store back to Volusion to verify your conclusions but I suspect you 1) did not make a full backup of your store's data and data files; and 2) you did not keep your Volusion store active (no-indexed and not attached to your domain) until you were sure everything was in proper order.

Don't forget that the Volusion Product Name Short field serves two purposes: one, as the URL and two, as the anchor text on your category pages (which directly affects your internal link structure).  It could be due to your breadcrumbs as Volusion takes the primary category of your site and uses it as the breadcrumb.  I'm not sure how that got transferred over either.

I think your BC store is salvageable but not without fully investigating the issues via your store and your analytics...as well as your back link profile.  For all we know it could simply be the latest Google updates.

www.website.com/category1_myproduct/269.html could be more powerful than www.website.com/myproduct/ but it could also be weaker.  You've added in the category name which may be redundant (I'm not sure without more information) and you've weakened the power of "myproduct" brought to your SEO.  Plus, you have now removed the 269 which for most people is the manufacturer's SKU or UPC code which many people search.

If a lot of your traffic was SKU-related (which you can easily find in your analytics), then you definitely took a step backwards instead of forwards.

Yes, BC gives you much greater flexibility and power with your URLs, but you need to carefully evaluate how to use that power and really understand your current traffic and its origins.

Curious why you didn't keep your current Volusion URLs?  With BigCommerce (which we are a partner), you can match the Volusion URL and forego the 301 redirect if you feel that's critical to your SEO success.  A proper 301 redirect should be adequate and not account for such a dramatic drop of traffic.

As an ecommerce consultant you need to understand where your traffic was coming from and make sure that's protected when you move.  For example, if your products have a lot of Facebook Likes, when you change the URL, you will lose 100% of those Likes...and this should be a factor in choosing a new platform.

You should be able to diagnose what's happening from your Google Analytics.  Take a look at where traffic has dropped.  What landing pages were driving traffic before and no longer are?  What keywords have disappeared and what pages were appearing for those keywords?  Are those pages 301'd correctly?  What products and categories were driving your traffic and revenue?

Obviously check all your pages for proper meta tags (INDEX, FOLLOW)...with these "simple" platforms, it is easy to accidentally make your whole store disappear.

It sounds to me like something was missed during the migration and you're now.  We are a top Volusion consulting firm and have worked on hundreds of stores...and we're partners of both BigCommerce and 3dcart.  You can have a successful store on a hosted platform.  Having PHP access is not critical to your success.  Yes, it can help but you migrated from Volusion which has much more restrictions than BigCommerce (in terms of what you can accomplish from a template perspective and SEO)...so I feel we're missing something here.

Dennis is giving you a good one and I can make a recommendation for your SEO services if you wanna pm me.

You may be in need of a second opinion.

Interesting. So you were ranking well on a hosted platform.

Also, is your developer and SEO the same?

Just curious if you were getting input from both angles or the same direction.

Were you ranking well prior to the move?

Definitely a possible reason as you are already losing traffic from it already. Something you should look at ASAP. Those pages should be redirecting to the correct, new pages so I'm wondering why they werent properly 301'ed. Was the 301 service only sending your previous homepage to the new homepage and not per page? (Or even old pages to the new homepage)

Do you believe your site requires complete access to the template?

Have you looked into OpenCart? I don't have a ton of experience with e-com sites but I've heard good things about this from developer standpoints. It's claim to fame is being open source, anyway...

When we handle big sites like this, there are a lot of possible problems that we face, some of which are

• the traditional ecommerce problem of "unique content" - maybe generic content or copied from a supplier (not saying you are doing this, Im just putting it out there)
• another traditional problem with category pages and it's contents

These 2 could affect rankings. Honestly, 404's dont matter much for us unless it's a vital part of the site, not on any pages of the site or if it had a lot of links pointing to it previously

if it's worthless, we just let them die, so GWT can stop bugging us with it by next year lol.

The 301 is actually the first thing that could be blamed as it might not be able to pass the same juice as it could before all the algo updates. You could try restoring the old site on a new CMS that you choose and run this side by side but it might be too much trouble.

Why are they giving you that suggestion?  What is their reasoning?

If you're trying to keep your business alive, Magento may be pricey for you.

Have you looked at 3dCart?

I would lean towards Magento for similar reasons to what Dennis said already. Also I just have had poor Wordpress experiences and feel like Google is out to get 'em. That last part is all in my head and completely made up but that's enough to sway me towards Magento.

maybe (maybe) sharing the URL will help..? hard to say, really, what the problem is.

I agree with Dennis. Sounds like it's time to bite the bullet and re-build. Take it as a lesson and move on.

In the meantime, have you considered driving in traffic through a PPC campaign? Might stop the bleeding..

Have you continued link building work on the current domain ever since you 301'ed it? It's really a tricky situation. It could be due to old links on the original domain (especially after penguin in may and the monthly pandas)

If you are sure that the technical issues are the main cause for your drops, then you better move it. Magento is actually pretty seo friendly and since you have a dev, then it's even easier. I would not recommend wordpress for big ecommerce sites so it will depend on your site's size.