first off, you are spinning too small of a prop, use atleast an 11x6, Master Airscrew are strong, but arent as are louder, and produce less thrust. Then there is good old wood props, They produce more thrust, arent as loud, relitivly durible and are cheap. Finnaly, we come to APC, which are the best of props today, they are light, durable, and efficiant, but they cost more. I use 11x6 wood props on my OS .46 AX and they have served me well