i have the same thing going on, only its noticeable, and its my front tires not the rear, i should probably just adjust the camber but if im not mistaken i think i wasnt able to get that turnbuckle to tighten anymore.
this is with a 12l4, purple fronts, pink rears, and im traction rolling quite a bit
ive goten the traction rolling just about nixed, useing less sauce on the front tires, and coasting more before tight corners, but im much slower through the corners than the fast guys
i should probably adjust my ride height, but ive only ran 12th scale twice and just wanted to try it out before making to many changes