Hallo!
Just to clarify:
The "stuck on the ground-problem": Today I couldn't reproduce it. But yesterday it happened several times. The plane didn't move just as the parking brake was on (but which wasn't).
My "pulling to the left with almost no escape-problem": It can be reproduced easily. Brakes - full throttle - release brakes. The plane starts immediately pulling to the left because of the effects the propeller produces (in my last post I said the opposite, lol I'm dumb
). To stop it from going left, I instinctively "step" fully into the right rudder. But almost nothing happens and the plane continues to the left until there is enough aerodynamic effect on the rudder.
I'm completely your opinion that a highly deflected nose gear at greater speeds doesn't have much grip.
But to me it seems to loose grip very early at low speeds. When full power is set even at 5kts or below there is almost no effect. It also seems to be intensified by the automatically centering nose gear.
Anyways, flying the plane is great fun.
CU.