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A slipper would be frickin' awesome! I'm running an EBC clutch and coated steels from Kenny. Great service from them so far.
I was asking about what year model clutch are you using? They have different stack heights, early vs late.
Also, I'm guessing you are not using that double-wide steel plate, correct?
I'm told the slippers being used in the DOHC's are good for several seconds faster lap times.

Another benefit is spring pressures are not so critical - only need enough for the initial launch mainly.
Lighter clutch lever pressure and the harder the motor pulls, the tighter the clutch holds.