have you tried to bump up the setting so it doesn't do it on that small of text?
I think text-based aliasing is something that can only be managed on a system level.
Have you tried actually tweaking the alias strength (not the minimum size)? I dislike OS X's font aliasing compared to Windows 7, but I found if I changed it from the default to light it was much better (so long as my PPI stayed high enough).