Yes, I always seal the control surfaces with clear Monokote on the bottom. There is a little wing rock but not to bad. I think I set my CG at around 5" but once you fill the tank up it becomes nose heavy and requires a little up trim to keep it in level flight. You know what happens with a little up trim and trying to fly KE. You got it, tends to want to pull towards the canopy. That changes if you fly til your almost out of fuel and then the plane wants to climb all the time. I set my timer for 8 min. and that way it leaves about 1/4 of the fuel in the tank which works out ok. All in all, no big deal.