Find a nice long building at one of the major airports and try landing a 737 on the roof.

I have the same problem with the Bell as rootbeer (i.e. landing) I can descend fairly slowly until I get to about 50', when it starts dropping like a brick, if im quick enough I go shooting up into the atmosphere, if im too slow I leave a dent in the ground. As for hovering...!
Any rotary-wing type chaps around that can give some simple advice?