Shaft109 - google BERP blades (British Experimental Rotor Programme) to see how some of the problems of high speed stall on the advancing side of the disc and low speed stall on the retreating side of the disc can be overcome using clever design.
The shape of the paddle creates a high lift tip capable of operating at 20 deg AoA due to the vortices it produces to limit spanwise flow from blade to tip and also to keep the flow energised over the tip itself.
For the advancing side, the tip is thin and swept - as you might expect for a jet fighter wing with a high MCrit.
Also aero-elastic tailoring changes the blade profile along its length reducing the pitching moments along the blade caused by high variations in AoA as it goes round and round.