I have one and have a couple flights on it. It was very tail heavy with the battery pushed all the way forward and hanging about half way into the motor box. I have now made a tray on the inside of the motor box. The battery now goes most of the way into the box with only a small amount sticking out from the cowl. In other words my battery now almost touches the motor. I also moved the controller and receiver forward. It now balances just behind the 3-3.5" CG range in the manual. I will fly it again in a couple days to see how it does.

I am wondering if the wing should be further back?