For the people that have tried to test it with Stability control deactivated did you press and hold down the button for the 8 seconds to totally disable stability control or did you just put it in competitive mode?
For the guy that tried it on the ZL1 I don't think PTM5 completely disables stability control. But I don't have a ZL1 so obviously I cannot say for certain but maybe you'll want to check to see if PTM5 completely disables stability control.
2013 Victory Red 2SS/1LE W/RS/NPP
2002 Bright Rally Red Camaro SS 6-speed Manual