Your question makes perfect sense and is a very good one. Both the GPS and INS offsets should be referenced to the same point, so you should set the GPS offsets from the center of gravity, just as you did the INS.
Your question makes perfect sense and is a very good one. Both the GPS and INS offsets should be referenced to the same point, so you should set the GPS offsets from the center of gravity, just as you did the INS.