Tire size for fender well headers??

Micky Thompson skinnys had 28"x7.5 x15's and they hit on turns plus the 4 ply on the street worried me
Now I have Mickys 26"x 7.5 x 15's and went 8 ply for safty, no problems with hitting headers except on a tight left turn with my friend(300lbs) in the car..

Ply Rating:8Tire Overall Diameter:26''Tire Tread Width:4.8''Tire Section Width:6.3''Wheel Diameter:15''Approved Wheel Width:3.5'' - 4'' - 6.5''Tire Weight:19.0 lbs

Tim