Back to my idea, most slicks have small holes in them to detemine wear. These are the holes you use to measure tread depth. I don't understand how getting your tires wet and driving down the driveway is going to determine correct contact patch. When you launch, the tire expands changing the contact patch of the tire, pulling up and down the driveway with a waterhose in hand cannot duplicate dragstrip launching conditions. If you are consistant and check the change in tread depth after every pass, it is very easy to determine whether or not you are using too much or too little air. Once you have acheived a even patch if you are still spinning then you might want to consider a different compound or larger slicks.