if you know your pitch angles are ok, atleast 10 degrees at full collective,you should only have about 6 at mid stick which should be enough for a hover, check the rotor head speed,i imagine you should have a head speed around 2100 rpm's,you can buy a tach at the hobby shop for preaty cheap and its a handy tool when setting up your heli,if you have good head speed and descent pitch and it wont hover maybe some one taped a brick to the bottom of the heli!!