Back in the day, we used to boil the props in water for a minute or two to get rid of 'stress'. Haven't used that technique in decades.

The manufacturer website says 15,000 RPM max for their 11" props, based on dividing 165,000 by the prop diameter:

http://masterairscrew.com/manualinst...tructions2.pdf

They have a Formula 1 high-performance series that will probably hold up better, or try an APC. They rarely fail, and need little balancing. They have lots of flash and sharp edges though.

Balancing is a forgotten item until one has a failure such as yours. Really doesn't take that long, is good for the airframe and electronics also.

I always hold both sides of the prop when tightening, thumb on one trailing edge and one or two fingers on the other. Balancing and sanding flash is mandatory, especially with MA props. I agree they are poorly balanced (if at all) from the factory.