The biggest problem with many helicopters in current versions of
X-Plane is simple - they were made for older versions & not updated
(including all that ship with it - I know, I built them). The
helicopter flight modeling has changed pretty dramatically during the
7.x run - for the better, but it neccesitates changes in the aircraft.

Of course, it's not perfect - but it's better than anything I've seen
in MSFS (any version).

Try a couple of the recent ones I've posted at x-plane.org, you may be
suprised...