OK, this has made some interesting reading..... Cheers.

Yes I can see the cg is playing a major part in this, it makes sense. As I said the wing was taken from the root cord of the SSE but I made it a constant cord so the original cg position on the spar would be incorrect on the new wing anyway because the SSE wing has a tapered trailing edge. (forgot about that one) So this coupled with the fact that the SSE cg location is on the conservative side has all made for an unbalanced plane.

I have just done a few checks on the plane and radio, I had only 20% expo dialed in on elevator. I generally use 25%-45% so this was a bit low even for me.

I did as suggested and checked for slop in the pushrod and it's Ok, but I did find more flex than is usual actually in the tail plane itself. So this could cause problems with bending under flight pressures. I had made few different designs with the tail plane and settled on this one because it was light as I was assuming it was tail heavy. ( How wrong was I?)

I also calculated the area of the tail and it turns out it's 21% of the wing area, not 25% as I originally thought, it was one of the heavy ones that was 25%.
I don't know where to measure the length of the moment arm from so I have measured from the center of the spar to the tail hinge line and it is 24 1\2 in. Is this too short ?

Even though the wing is constant the aileron is not, it is tapered. So the tip cord is 13 3\4 in as the aileron is 2 1\8 at the tip and 3 1\4 at the root. Sorry I forgot to mention this.