ORIGINAL: piper_chuck
You may not realize this, but holding full up will actually slow down the takeoff run rather significantly. In addition, it creates a situation where the plane will takeoff before it has adequate flying speed, exposing it to an unexpected snap roll.
Since the plane sits with a nose high attitude, try leaving the elevator at neutral until the plane has developed enough speed to takeoff. Once it's at speed, you should be able to pop it off the runway with just a little up elevator.
On the takeoff run it seems to reach a speed where it just won't go any faster. It seems like lifting the nose wheel off the ground during the takeoff run allows it to accelerate a little more. Once it's in the air it's flying very slow but I ease off the elevator and it picks up speed.
Right now it's marginal but doable. I figure even a small increase in power and/or decrease in rolling resistance should produce a significant improvement.
Anyway, I'm gonna try the lager wheels and a few different props.