mebeached: getting better above 80 I guess is less likely the tire balance. I once had an old Datsun that behaved like that from a bent frame.... at the time, the economics of replacing the tires periodically was more feasible than straightening it out )

bigdude: Those hoosiers hook mad... I love 'em! Mine are bias ply and I am running tubes and rim screws (only on the strip), hence my lower pressure. I've found optimum 60' at 11.5psi with my setup. I have mickey sportsman pro's for the street, also with tubes.