Heliringer,
Set the N2 prior to takeoff, then leave it alone. You may sometimes find that it takes a little increase at a hover due to power demand as compared to at flat pitch. Sometimes they will hunt, so you have to sort of go with the mid-point. The last thing I would ever do is decrease my RPM. The linear actuators always seem to cooperate when you make a reduction, but sometimes they do not when you need an increase.
These remarks are based on over 2500 hours in Bell 206 variants. About 2000 of that has been as an instructor.
Saber 09