Yosemite OS X running slowly, BC Win7 working fine?

A month or so ago, my 2011 21.5" iMac suddenly started running painfully slowly - spinning beach ball for seemingly simple tasks like opening my applications folder, a browser menu, etc. - making it impossible to actually use for anything. I had been utilizing my iMac primarily for gaming in windows 7, and using Mac OSX for school/work. I had FileVault Enabled, MacAfee was draining resources, and was running Mavericks at the time - a combination I thought was causing the issue. I wound up removing my windows partition, completely wiping the HD and doing a full recovery mode upgrade/reinstall of Yosemite. FileVault couldn't be disabled for some reason, so I completely wiped the drive, and did a clean reinstall of Yosemite. I initially tried to restore to an earlier date via Time Machine, but it didn't resolve the issue. I was almost convinced that it was a hardware failure after all of my troubleshooting steps (as advised by my friend who is an At-Home advisor): I reset PRAM, verified and repaired the drive as well as permissions via DiskUtility, etc., but the performance issues continued.
So I was growing more convinced that my mac was dying (hardware failure) but I wanted to try one more thing before making a genius bar appt, and that was creating a fresh Bootcamp partition with a windows 7 install. And the thing is, everything is currently running fine in Windows - no slowness, performance issues, or constant "working" icons (glowing circle/beach ball) so it would seem that it isn't a hardware failure causing the issue (to my novice logic) but rather it seems to be isolated to mac OS X. (I am clearly trying to avoid hauling my baby 60+ miles away for a genius appt., but if that's what it boils down to, I will).
My hunch is that the issue lies with finder, as it's the little, menial tasks that are crippling performance - opening folders, interacting with the dock, opening a new tab in a browser, opening format options in TextEdit, etc. Relaunching finder doesn't seem to improve things for long, and I have performed an additional clean reinstall of Yosemite. I've browsed the forums and scoured google for someone having similar issues, but it always seems to be that they're given the same troubleshooting steps I've completed, or told it's a
hardware failure. I think this may be a bit different, and I'd appreciate any help offered. Let me know if I can provide any additional information, and I apologize for the wordiness of this post.

Activity Monitor - Mavericks  also Yosemite
Activity Monitor in Mavericks has significant changes
Performance Guide
Why is my computer slow
Why your Mac runs slower than it should
Slow Mac After Mavericks
Things you can do to resolve slowdowns  see post by Kappy
Try running this program and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read.
Etrecheck – System Information

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