I dispise the Firebird. They Have no rudder btw Highlander , have a V-Tail, climb and descent by giving it throttle.

I never had much luck with my Firebird either. I now have a Superstar and have never looked back. I think you will be much more succesful and have a beter time if you start out fresh with a glow powered trainer, I did. Not to put down electrics, great part of the hobby, but the Firebird in particular was a waste of money imho.