Yes, I should mention that Edge *does* recommend installing a spacer on top of the stem (as do, apparently, many carbon fork manufacturers), but nonetheless the plug *must*, by design, rest on top of the steerer (see picture). I agree that shortening the steerer is not the way to go.

My guess is that the top of this 'compression plug' (as Edge calls it) must follow the usual rule of being several millimeters (2-3 according to Edge) below the surface that the top cap rests on. In this case, that means 2-3mm below the spacer. BUT, if I do that, then the conical Edge top cap comes into contact with the plug! It's a Catch-22 if I follow their instructions.

What I don't have an image of is the Edge top cap, which is strongly conical - it has a funnel shape on the underside. As crazy as it sounds, this unqiue shape seems to suggest that contact is desireable.