Get your rear camber adjusted to increase the tire contact patch. With wider tires, handling shouldn't be too much of a problem. Back when I first lowered my car on 305s, camber was so bad you could slide a card underneath the tire. There was barely much contact on over 50% of the tire. It's much better now. I just need to get the front ones adjusted.
Definitely check the rear bushing on the differential. Mine is just starting to crack and show some deformity. Then again I hardly push the car, and I also feather the throttle enough to reduce wheel hop if I launch it. I've got the Whiteline bushings... just gotta find the time and tools to get it installed.
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