Help with a ridiculous half-broken Yosemite/Mavericks install?

Hello all,
I hate Yosemite. It's the Windows 8 of OS X...with broken DNS to boot.
I was troubleshooting some video issues, and decided to try and see if the problem persisted in Yosemite.
I downloaded the installer from the App Store and begun the install process for an installation on a flash drive.
After the install completed, my iMac rebooted, and to my horror everything was Yosemite-y. I shut down and unplugged the flash drive.
My suspicions were true, Yosemite had gunked up my Mavericks installation pretty bad. The boot logo was Yosemite, and my mac booted to a Yosemite installer at startup. I tried using the "kind of mac bootloader" that is invoked with the option-key, but my Mavericks install didn't show up. Luckily my Mavericks Recovery Partition was bootable, and after 2 hours of trying different ways to find and mount my Mavericks partition, I was in. The reason that this took so long was because at every step of the way, Yosemite tried its hardest to hide my Mavericks partition. (A process resembling the acts of Malware). My Mavericks partition boots, but when I startup my mac, I am greeted with the Yosemite apple logo, and Yosemite option-key bootloader, and then my Mavericks login screen.
How did this Frankenstein of an OS even become of existence? I checked, and yes, Yosemite installed onto my flash drive, NOT my SSD, but it still shoved all the boot crap onto my Mavericks install.
Is this even fixable, or should I restore from Time Machine? I'd rather not have to reinstall, but will if needed.

Do a backup, preferably 2 seperate ones.
Revert to a Previous OS X
Revert Yosemite to Mavericks
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.

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