Yea it was the first time that I have seen it and I don't ride the clutch which I think would cause that, haven't launched the car but once since I've owned it. The clutch looked very new, tons of material, just a 1/2 centimeter in the center of the disc, perfect circle, that fused to the flywheel.
Anyway put a 6 puck act unsprung with the sbc pressure plate and it is much easier to drive than the sbc sprung full face disc, so I believe that maybe something wasn't setup right.
There is a slight noise on deceleration while in gear. I've never run a 6 puck disc or an unspung disc so I do not know if it is normal but everything feels great.