When hovering in ground effect, the helicopter experiences an INCREASE in performance, i.e., the helicopter can lift a heavier load at a given power setting than what is possible if hovering out of ground effect.
Red B.
This is what I experience every time I fly the heli. Coming down to hover at waist level, the power can be slightly reduced to maintain constant altitude.
BTW
Have you checked the amps / RPMS at different airspeeds?? Just want to know how much extra amps can be pulled during flight on my 3D foamies. To calculate a buffer without burning the speed-controller

.
There is a post on this forum regarding "unloading engine with leaf-blower" He ended up with the same RPM with and without simulated airspeed. This implies that the load on the motor is more or less constant no matter if the airspeed changes within a given value.