I balanced mine at 102mm. It still does pretty decent flatspins. Not sure about the nose weight. Some have them..some don't...mine doesn't.
That' s a fine repair job you did...looks very sharp.
The big thing to remember with the phoenix suk is that it's not a 3D plane. Keep elevator throws as recommended. I think I have around a half inch up and a half inch down on the elevator. This plane will snap if you get too much throw on the elevator. As for rudder and ailerons..well, those are maxed out.
It lands surprisingly well, and does really nice scale tumbles. All in all, a great sport plane.