I am only saying that in production Reed motors like an A35 or RD250 their pistons have conservative windows. They have stood the test of time for 30+ years. Millions of dollars of engineering developed them to work this way to their optimum performance and reliability. The Rd250 went from 10bhp to 60bhp just by simple modification. Same motor just different porting of the cylinder and piston. Fractions of mm's doubled hp and shapes of ports were the key not size. Ovals, squares with rounded corners and trapezoidal ports worked best for flow. I have even seen a teardrop shape.
It is evident in the polini piston that is cast to be balanced due to its aggressively ported channels. But you know that. You are just looking for a fight, dog. Relax a little. I never said it wouldn't work or go fast. Race cars go fast just have to be rebuilt slot.