Well...hmmm....the centerline of the plane that the incidence relates to is otherwise known as a "DATUM" line. It's the line that every part of the aircraft is aligned to. It's most of the time easy to identify in the Aerobats as the line the cockpit lines up with, and it runs through the plane. In that Edge, it might be difficult to identify because the cockpit is removed, and it doesn't leave much to go on....other then the "turtledeck" shelf..and this is the portion that the forward and rear turtledecks are built on.
Basically the only incidence adjustment your going to get is the rear horizontal stab anyways......the wing is what it is...and it's very close, if not right on.
I'm near done with my Edge also, and yes I checked incidence and went to zero on that stab. The wing was already set, and very very close to zero, so I set the stab off that.
I did also have issues on the mounting of tail-group as a whole, and I ended up reshaping/reworking the bases on which the surfaces mount too, I also found the vertical stab was atrociously mis-cut, or not cut at all at the base, and the fit of the tail-group out of the box was so far off it was pathetic. The manual said "some cutting may be necessary"...ppplllllleeaasssee!!!! It was an engineering feat to make it fit(just kidding), it did take some time though... It's much better now after a week of evenings engineering, and I have full confidence in the install, and look forward to very strong tail section.