Congrats!
Sounds like you have the N20's but a pic would sure help.

The jet didn't fly very well as a tractor set up (too tail heavy) but flew
great as a pusher with the Defender props. (minus the huge plastic nuts)

The CG was about an inch behind the cockpit. But since you have a heavier
battery I'm not sure where it is now. Try gliding it close to the ground in
thick grass. Some tail trimming may be needed too, as you can see I
bent it up pretty good back there.