It looks like it was my bearings. I approached the issue from the least to most expensive solution. Unfortunately the most expensive issue was the culprit.
Step 1: Knockback springs in the stoptechs. Showed a little bit of improvement but knockback was still there in hard esses (and of course the corkscrew).
Step 2: Replaced front wheel bearings. I've only driven on the street but so far I haven't been able to get any type of knockback even in high speed abandoned parking lot manuvers.
So the moral of the story is that wheel bearings are now part of my annual track maintenance plan.