I may be wrong but a prop or wing create no lift when stalled, you are talking about a near stalled condition.
Lift does not drop to zero after stall occurs. There is a typical lift and drag plot.
http://en.wikipedia.org/wiki/Airfoil
RPM at speed is dependent on many things engine power curve, the prop characterisitcs, and airframe drag. We normally see a drop in current and power in electric models as airspeed increases. In the more pitch there is the less it usually unloaded, but it depended on how clean the airframe was. And in an electric model if RPM goes up, power goes down.
The below video shows the launch of F5B models. The models in the video are turning ~18x18 props at ~2100W.
http://www.bayrc.com/videos/f5bteamtrials.wmv