The glide issue with the MT prop is the very flat fine pitch setting, 2700 (engine redline) static RPM, which maximizes takeoff acceleration from a standstill and decreases glide performance with a windmilling prop. I’ve been flying one for 10 years, electrically controlled in my case which limits the rate at which you can move the blades if you really do need a good glide ratio. Otherwise it makes glide control on a normal approach very simple: you carry power on final unless you want to go down quickly in which case it will quite usefully sink like a rock with throttle closed.
The MT prop will likely change the performances from POH values - it certainly does on my plane.
A guy local to me in the US has a Pinguino. I’ve seen it flying, very slow climb speed compared to an SF260 which it superficially resembles. That’s all I know
