Thanks guys,
I think the main thing is that I've got an O.S. 46LA on the nose, instead of the heavier Evolution. I think I was probably a bit heavy on the epoxy on the tail and securing the control horns as well (I removed most of the glue where I applied it to the control horn backplates though, but it couldn't have been more than a quarter ounce of glue). As for balancing the plane correctly, I had the LHS check it as well, it came in 11 ounces tail heavy.
-Sam