ill chime in on my experienceswith twin disc clutches so far.
I had an early model OEM one from 2007, when they were having issues with them overheating and warping. It was a decent clutch but one day at the track and 3 passes or so and it was gone.
Upgraded to a spec super twin P trim that was suppsoed to hold 1400 ft lbs of torque. Great street clutch, no noise no chatter, easier than the GT500 OEM and my spec single disc 3+ was from the previous 5 speed trans. 4 passes at the track and it was gone. Melted the clutch material to the floater plate.
Maybe it was a bad clutch, maybe not by 2 discs and 300% more surface area to me = 2x the heat and thats why it melted.
I honestly dont know where to tell you to go from here, i went 4R70w Auto.