I know neither are T4s but I run 75/30 on my 13.5 B4.1 and 75/26 on my 17.5 SC10. B4.1 never gets beyond high 130s (maybe it's hit 140 before) and the SC10 is between 150-160 after a 8 min main outdoors. I've seen it go up to 180 though, but I think I was practicing for over 15 mins.