Engineering 102:

When destruction of the third composition propeller in two days occurs, blame the propeller and engine hub design rather than admit you're doing something wrong. Argue with the guy that has 30 years more experience than you do how bolt clamping forces are inadequate to effectively secure a propeller. Describe how propellers should have a hard insert laminated into the prop at each bolt hole location. This in spite of the fact that thousands of people have been doing so every day with absolute success around the world. Then claim the engine makes more power than a "normal" engine with more violent combustion pulses. Use an associate engineer to reinforce your position.

When what you are doing fails to work, blame the product. Always blame the product....... Where does stupidity end for engineering brilliance to begin?

Common sense 101. Torque a fastener to the correct value and go play.