well considering having pinch is good removing any pinch at all would be bad. i have a brand new sts d21t mkii and you have never seen this much pinch pre-breakin my losi flywheel didn't have enough surface area to grab on when heated up with a heat gun. used my hpi flywheel and all was well. used that flywheel for 4 slow tanks and losi flywheel after heat works everytime to answer the main guys question just run it rich and always let your motor cool at bdc it will loosen up as time goes on and invest in a good heat gun that always helps