steiny,
you are flying the bipe with the dle20. That engine needs a throttle curve. I built for dle but it will be too nose heavy with that, so I went with the 110 instead. That has a lot of traction but not as much as the 20 and the throttle is linear.

Its not the throttle pumping but the amount. He was going from 60% to 100% almost every second. Thats why I said the centrepoint of currve needs to be more reactive in my case.

It flies like a trainer at low rates.

ameyam