I remember those landings some years ago. Go buy the wooden props by the half dozen or dozen. They splinter when they hit the tarmac but a lot cheaper and easier to replace than a bent crankshaft. When you stop breaking props on landings, then go to the plastics. Sounds like you are flairing to hard or too high off the runway, or flying it to the ground. If you have a flight simulator this is one of the things you can practice on it.

Glad to hear that you got to fly, the landings will get easier.