I have no idea on most of your questions, but the 40/40 seems like a good starting point. I have noticed by observation that competitive STS rubber gains about 2 seconds over sporty all seasons, on a 65 second course. Enjoy!
05 ZX4 ST - parts donor. Daily driver until a rock found the oil filter and locked the motor.
08 S Coupe - autocross toy. Less weight and more tire.
06 Ranger - lowered commuter and parts hauler.