BY the looks of it in short STICK to the makers recomended CG , im sure they have done countless hours of R&D to get it to a point they recomend. and yes there are too many variables in jets as heavy fuel load , heavy UC , delta wing vs conventional wing type etc.
One feel for a nose heavy CG wud be I guess how much the nose drops or how much UP one has to feed to hold in a 45deg banked turn, and\or if she runs out of elev travel upon final flare,
anyways great to see there are so many with near correct answers. , maybe some expert jet test pilots can chime in ali mac , dave s, etc