I ran 8.0 and 7.5 lbs. in my 6+ yr old Goodyear 16x33x15 with no issues at 147 MPH in the 1/4 mile.
I bought a new set of M/T 14x32x15 stiffwalls at 7.0 lbs. also with no issues on the other end that I can remember. My rear rims are 15.0 inch wide also shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)