You said the plane flys well, take it up do an in flight C/G test. Do a 45 deg. upline pull power to about 1/2 roll inverted and see what the plane does. If it pulls upward prob. tail heavy, stays 45 deg. prob. just a little tail heavy, pulls down quickly, too nose heavy. What you want is just a slow downward arc. The airplane wants what it wants regardless of what the calcs. say. That's why we test fly. Of course it also depends on your style of flying. you might want it slightly tail heavy or nose heavy.Just adjust till your happy with it.