i usually run at 40psi all round however for the drags I lowered the fronts to 32psi, and im rolling on Kumho's too, I agree they are grippy as heck but still managed to spin them clutch dumping off the line.
I tried launching 2 ways, Clutch dump saw a 16.3 or 16.2 for the best run.
Coming hard off the clutch without dumping saw 16.8 at best as the car just boggs down ( i assume its to do with the electronic Throttle body/Traction control as the power would hesitate and sort of chug before coming on in full with minimum spin)
I still think a wider tyre would help a bit. We will see