slicks help!

hey guys iwas given what i thought to be 28/9/15 " slicks i mounted them on some 10 holes and these things are huge! i think there 30's it doesnt say on them how big they are, i mounted them with 12.5 psi and they rub my ground effects i was wondering how low i can go with psi, and i have lake wood lower control arms and i can set it one step higher do u think this will help or should i just not bother going to the track!...thanks


and i know Run on sentence haha
 
lol i know where i got to go man, im going for union work, and the union is already going to test me, and then i need to get my alberta B course, so i can go to alberta and work, non union is good and all but u dont get a pention from it like u do in the union, i dont plan on doing high pressure welding here because theres none to be done. :)