Have you tried setting the minimum smoothing font size to a very large number using TinkerTool?
Alright, well that one also has high DPI... so uh... hrm, can't help you. Just a preference thing I guess. That and my vision is crap, take my glasses off and I can barely see my own hands 😉
I assume you tried the terminal commands as well?
I would if I had a list of commands to try! 😉
defaults -currentHost write -globalDomain AppleFontSmoothing -int 0
The number 2 here corresponds to Medium - Best for Flat Panel. You may also use 1 for light smoothing, and 3 for strong smoothing, as per the original OS X font smoothing options.
killall Finder
Some apps do their own font smoothing technique. You can't help with those then.