There is problems with twin disks aligning right and I've heard people having issues with the CC and exedy twin discs.

If you're all motor you don't need a twin disc its severe overkill. All you need is a stock like pressure plate and an unsprung disk.

I always shifted 9500-10000 and never ran anything but that. HD pressure plates are bad for all motor mainly because you'll never make enough tq for it to matter.

You want an unsprung disk so you don't pop a,spring out