I've been tuning my car on E85 with 106 lb/hr injectors for the last 2 weeks and have found the limit of the TU purple pressure plate. The clutch is the most awesome unit ever, but it does not hold 30+psi on my 2.5L Luckily, the clutch only slips when the boost spikes a bit over 30, but fully engages again when the boost settles around 25-30psi (need to stabilize my boost control).
So basically, if you want to build a torque monster that runs on alcohol, get a Spec clutch or a dual diaphragm pressure plate.
-Clark