I'm experiencing something a bit different, but still under the “very sensitive steering” subject. I notice this when I accelerate and change lanes (like when merging) at the same time. The car’s steering loosens (I feel that the EPAS might be over compensating). As a result, the steering wheel jerks enough where I have to compensate in the opposite direction (which ends up being over compensating with the loose steering). The outcome is a “decent wiggle” during lane changes - looks totally amateurish. I haven’t taken my ST on a long drive yet, thus I can’t speak to the drifting that occurs at the 30 min mark.
2013 Focus ST