FWD cars have wider front track, but since you use different offset rims, the rear must be wider and more offset so your rear track should be the same as the front.....Yup, wider and lower profile for rear and narrower and higher profile for front looks good also, but not good for the tyres.
I have one member even though, using RWD with the tyre and rims setup like yours still cannot wear the rears off, so after 5 to 6 years in the rear with 3 to 4 sets used up front he had to change the rears also...
---------- Post added at 09:08 PM ---------- 6 hour anti-bump limit - Previous post was at 09:05 PM ----------
To me, modding got it maximum also. Maybe the UR made it too stiff, just like suspension, if very stiff will be good for track because flat no humps extra. If use super hard suspension and when in corner hit slight bump the car will lift and will not have traction at all....