sorry I lagged on getting in here.. I've been wildly busy moving my company.
The tires will be gripping the road a lot more with wider tread and with the soft rubber bushings from the factory, there's a lot of room for the control arms to wiggle and make the car a little eratic.
I'd start by going to poly-urethane bushings in the A-Arms and RLCA's. Get yourself a panhard bar from Maximum Motorsports too, and a bumpsteer kit and MM CC plates. That shoul allow you to dial in the alignment, firm up the lateral control and keep a little tighter hold on the car's direction.
Grooved roads give me the same hassle and I have a full MM max grip box, so there's going to be a little grab no matter what. Mine never jerks the wheel from me but it does track grooves like a sunuvab!tch.
If your main issue is with bumpy roads more than grooved, then it sounds like you have a crappy alignment and a bumpsteer problem which are easily corrected with the parts list above.
EDIT: Without driving your car myself I can't guarantee that the above will work but I'm pretty sure.
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