It appears to me from reading various performance figures published on manufacturer's websites, that they have been fiddling with the prop for best presentation of climb and cruise numbers, as well as probably sticking rigidly to the microlight 450kg figure. Asking around about these differences gets met with some bemusement that I would not take such figures with a pinch of salt. Next part of plan it to fit a VP on my CT.
They probably see themselves as in a spec race and will not yield to frankness as they perceive their competitors to play the game the same way.