Get it in the air and then start making assesments. You seem to have many large planes, Cg issues being set perfect are for new flyers to giant scale. Unless your adding something totally different in weight to the plane the maiden should be a no brainer. I was able to add about 1 1/2 ounces to the tail for a perfectly neutral flying plane. This is with a 3pound BME on the nose.

I want to see some flyby shots of the plane and some ear to ear grins on your face after the maiden.