ORIGINAL: proptop
Trainer type airplanes are typically set-up a little bit nose heavy. Your PTS Mustang is a fairly well proven design...it should be OK the way it is.
Proptop, are you serious? I've read many of your posts and know your smarter than this. Are you realy advising to blow off checking the CG before the first flight? That's terrible advise. The plane probably is OK, and RC Ken's diagnosis and advice are solid, but skipping the CG check would be a big mistake, especially if somthing is amiss.
rrragman