with regard to my 5x5 prop...
It's doing the aerodynamic equivalent of what's referred to in cars as "burning rubber".
I'm sure you're right Don. That's why I feed in the power gently. And it's no bad thing. I don't want too much thrust too quickly 'cos it causes a pitch down.
In any case I've ordered a 6x4 prop now, so we'll see, come January.