My car will 60 at 1.29 in good air and about 1.32 in bad air so we are not that far apart on 60 ft times. I run Hoosier radials and have for the past 10-12 years. 13.5 X 31.5 They are fast , consistent and wear like iron. I still cant imagine that 4 - 5 hundredths quicker in the 60 ft times will kill the tires. I typically run 12 - 13.5 lbs of pressure in my tires. The ones on my car right now are 2 seasons old and most of the holes are gone so this is this last race weekend for them. Well over 100 runs.I would imagine those sportsman cars are approx, 1000# lighter than me. Best 60' to date has been 1.25. We're going to try leaving a little harder next spring on good tracks.