Question - you did have REW do a direct content transfer for you right? (As in from your template to your LEC?) If that is the case, there is absolutely no reason you should have lost rankings - LEC frameworks are as SEO friendly (if not more) than templates - also I have done a ton of these conversions myself and not lost appreciable rankings in fact most cases have improved almost immediately.

So question becomes - how much did you change on the dev location before you went live?

I did a quick check on your homepage and honestly it's not a pro job but your homepage SEO seems quite sound (I do wish you would get rid of those pipes in your title though, they seem so tacky these days) - they aren't hurting your SEO, but changing it to be something more readable might improve your CRT.

When you say you lost serious ground - can you give some examples?

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