A warped flywheel can cause driven clutch disc springs to fail. It's always a good idea to surface the flywheel on a clutch job. Long-term slippage can also heat the springs, making them brittle and easier to break. If your flywheel is bad, you'll know before long, launching or not (just kidding about the launch). In my case, cockpit problems were the culprit, but I was a mere callow youth at the time.