RE: ROO GROUND HANDLING PROBLEMS
One other thing on landing, slow it way down with the air brake. This will eliminate the Kangaroo bounce.
I have almost 300 flights on mine and have used a JR gyro from early on. Makes it so easy.
I prefer full throttle take off's, because the full thrust holds the nose wheel firmly on the ground.
I have used a 17 and 25 lb thrust engines on mine. I prefer the 17 lb engine for ease of take off and especially landing.
Use 20 degrees caster on the nose wheel. Wheel should be behind the strut turning axis for stability.
Have fun,
Pete