Oh ,I don't think that I understand that either!
Most people that come here is wanting to make their stuff go faster ,but ,you can turn the high counter clock wise
about an 1/8 of a turn to tame the high end down some!
If your buggy was running good the way it was ,but just the idling too high ,I would put the settings back the way it was ,if
you remember where they were!
I would check other places that might make it rev high like ,the transmitters servo adjustment rate ,it could have accidently
got moved ,or...