8 tooth pinion ok, if you run 3 cells better to put cut of at 9.v you will notice the head speed decay before you get to this on 3 cell.
On "current limiting" you set to "diasble' as long as your chopper not over geared then you ok and you not want your chopper to fall from sky right! if a problem, maybe better to catch fire and try to land it!then put out fire.
i fly with current limit on disable with no problem .