I’ve found and heard that 14-15psi with a stick is about where you want to be; and hard walls or tubes in bias slicks. Stick car here and above 15psi it’s spin city; I have M/T ST tires and tubes fwiw. How much bite the track has has been a problem for me; also I don’t have a slipper clutch, same as you. THAT is the hot ticket tho! I’d try lowering the launch RPM until it just about dead hooks; you want a little tire spin.
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