Drag slick compound. School me!

I talked to some of the Comp teams running a stick with radials. Obviously with as fast as they are you can do it. They all said you have to run a totally different clutch set up with radials. They leave around 6500 instead of 8000-9500 with a bias tire. Stick cars usually require a stiff side wall bias tire. A heavy automatic bracket car just run a drag radial with 16 to 20 psi and hard compound.