I just have to chime in here. Every example of the H9 Edge I have seen has been a great flyer including the one that I own. The only fault with this plane is the original wing issues which seem to have been corrected by the revison.

Roadracer,
Not trying to say you do not know how to build a plane just that maybe it is time to have a more experenced builder look at the plane. I am sure that the problem is just some small thing you may have over looked or might not have known was wrong. I pretty much think the problem you are describing should be one of two things. A problem with the main wing or the alignment of the elevators. I would look at the main wing first. Maybe see if Horizon will send you a replacement main wing to try.
I know that these problems can be very frustrating but hang in there because this is one sweet flying bird when correct. Also I would not put any dihedral into the main wing. Just make sure the leading edge is still straight after joining and that there is zero diheadral in the wing. When the wing is truly straight it will almost look to have anheadral in it when viewed due to the way the wing thickness tapers on the top and the bottom of the wing. Also check and make sure there is no washout in the main wing. This can cause the problem you are having if one side of the wing has washout and the other does not.

Good luck,
Sport10