It's amazing you were flying it with the CG that far back. I know it's possible, but you'd be "stuck" in a harrier all the time. It's obvious you had previous profile experience. Most guys would just say "it's too twitchy" on the elevator.

Be sure to check your ailerons so they will not be in a "flap" mode. If you can adust on your "TX" then do that. That's the most common problem among guys who say their plane is "mushy" all the time when the CG is at 5". It would actually do better harriers inverted when the ailerons are pointed down slightly like "flaps", but upright flight isn't very crisp.