The GCD detection probably needs fixing for certain classes, since it uses baseline spells (Warrior is set to use Strike). I'll play around with it real quick and see what's up
And yes, if Ignore GCD isn't working properly then the end will also not work as intended.
Edit: They removed Strike (seem to start with Heroic Strike directly now). Setting it to use Execute instead. Should be working, but I'm testing with about ~800ms so any real GCD testing is kind of hard to pull off