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One (or more) of your best ranking pages got hit by DMCA perhaps? 60% is quite the dip. That sucks man.
As of SEO tools, I use SerpRobot. It's a simple and small service, which checks your pages + the keyword rankings every 24 hours, so you can see the history of your rankings per page. Believe it's about $50 per year or so, for quite a large amount of keyword tracking.
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