I would recommend changing the shadow of the rotor when it is in motion, tends to be moving so fast you dont get the limited frame rate strobing effect in the cockpit when the sun is overhead. Not sure if MSFS allows a shadow value between being either on or off.
The human eye blends it together so you dont see the blades shadow so vividly like a camera shutter would.
The rotor already seems to have an animation where once it gets to a speed it blurs, the same thing should be happening with the shadow at the same time.
Maybe a pattern of dots, or overlapping crosshatching?