Diablo superbikes? I run 27-28 cold...but try to keep it 30-31 hot, slightly lower on the rear. (I run 190/55 on '01 rc51). I love these tires but they seem to go very fast, keep an eye on the rear for flip time.
If these tires are wearing out fast (as stated above) something is wrong with your suspension or you are running the wrong compound or the wrong pressures. When set up correct, these tires last for ever even at a fast pace on a 1k