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You have gotten great advice from others in this thread, but I just wanted to add that anytime you substantially change pages on your site, Google will either reduce your rank or de-index the offending pages completely for an arbitrary amount of time. This is done so as to prevent people from figuring out how to game the search engine. I have seen it take upwards of a few months to recover search engine rankings after a site overhaul.
The moral of the story is to not put all of your eggs in the Google basket. I know it's hard, but try to diversify your channels.
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