RE: CG check
There is a very spicific post on RCU that addresses te flaps mod for this ARF. I will try to find it ASAP and post a link. It's a very easy setup to make, I don't think it took long to do. Using flaps, the landings are a breeze. It's very trainer-esque, landing in less than 100 feet rollout included.
I am surprised that you are using such a large prop on the 46FX. A 14/6 3 blade?? can that be real?