I have a Great Planes AT-6 Texan and added hobbico mechanical retracts to it. I have only flew it twice and both times it came in hot. I bought a C.G. machine and it measure about a half inch off (nose heavy). I am just going to move my battery back for now, my question is should I rely on the c.g. machine balance it out all at once or does adding retracts change the c.g. of my plane? Thanks, Willie.