Warmoth is just reselling Schallers, which are very good tuners. If you want tuners that you do not have to re-drill for, check
HERE. They sell the import Fender tuners. As for the bushings being loose, I have seen people wrap a little tape around the inside of the bushing before pressing it into the hole to tighten it up a bit.
EDIT: also Hipshot HB7 tuners should fit a mexi Fender with no drilling. You can get them
HERE