The moving the thrust line down a bit will have very little adverse effect if any. Do watch the incidence setting on the wings though. On mine, I found that the top wing needed to be about 1.5 degrees less angle of attack than the lower wing. I did have to add some right thrust also but, once trimmed out, this was one of two bipes I have that require no trim changes when you go inverted; i.e. hands off level flight either upright or inverted.