Sounds to me like you're seeing these rankings, then you're trying to 'tweak/optimize' these same pages to go higher in the ranking and so those 2-3 weeks are w/ index A and then your new 'tweaked' page Index A version 2.0 gets indexed and throws you into a new ranking/tailspin
Best posts made by choiceenergy
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RE: Why Keyword Ranking Fluctuate?
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RE: Re-branding with Google Analytics
You can export all your data to csv/google docs? Then just run comparisons through excel or however you see fit w/ that data.