what kind of slicks are you using??? I would say start at 10psi cold and do a nice big burnout to warm them up, then after that run check pressure because Im sure it will raise.... Keep them around 12psi warm, and then see how she does.... You can always take more pressure out, you just dont wanna take too much out from the start, and bog and mess up a driveshaft or something... Just drop it a little if it doesnt hook right, and then once you get it where you want it, stay there....

As a side note, if you take out too much pressure, dont put more air in..... Just launch higher