The bumpstops were the culprit. With them off, the car rides pretty much identically to stock.
The only problem... now I don't think the rear-end is stiff enough. When it was on the stops, it friggen turned way better.
Hopefully just cranking the rear to full-stiff will get some rotation out of the car at the track. But even if that's not the case, I'm super stoked that it's still nice and comfy on the street.