Yes,your right and I'm not abandoning my x440 prop as it is fast on the topend.but does cavatate some.This is a better prop on 12 cells but the 220 prather is better on 14 cells ,I will run a x445 just to get that quick turn to turn blast of accelleration .So I will swap props to suit the need at the time.As I said ,there is no perfect prop.