I also have a south bend clutch in my car.
I tried the full ceramic ss-x package because I ran a Kevlar disc south bend and it glazed the surface an slipped on hard acceleration.
I talked with Tim from tmzperformance and he said the full ceramic clutch disc should be better for my 400hp galant.
He said a Kevlar one will slip if you get it too hot and glazed and that can happen rather quickly with full weight galant with some power.
I only have 500 miles on new ceramic disc so I can't tell how it holds up but I do like the pedal pressure and feel of clutch. The pedal is very easy to depress.