Looking good guys!
I can't handle dihedral in high wing planes, it just feels weird to me. On low wing planes its fine. I believe that's to do with the fact that I didn't learn to fly RC on a trainer plane (first plane was the Bloody baron, then the Sportster) and went straight to 4 channel. I also can't stand 3 channel, I can do it it just feels weird and like I don't have full control. I did a lot of stick time in the simulator before any real flying.
So my point here is I'm a bit odd with dihedral, and I don't want you to have a bad experience because of what I did. That being said I bet you guys would be fine.
I eliminated it in my last build because I felt it would suit me fine and I wanted to be sure to eliminate dutch roll that I have experienced with this plane, but adding directional stability (ventral fin and dorsal extension) would probably be all I needed.I have noticed the plane doesn't track as straight with roll so constant adjustment are needed when flying straight.
It is easy to add some dihedral with an aluminum spar if you use Nerdnics technique. If you do keep the dihedral I probably would reduce it.