Vekkinho, yep I agree with that, it should be compared to F4 ;) and MSFS is a great platform for realism too.
mvsgas, I don't doubt what you say, I'm not saying you're making it up or anything. I just happen to have heard many times from different Viper drivers that you don't have to trim for speed. As I said weight imbalances are a totally different subject, and there is also the possibility of trimming for airframe fatigue in old planes, that's why you probably see the trim needles not centered.
To put my opinion/point more clearly. I have been able to reproduce real world F-16 flight and attack profiles in F4 to the number, including bank and dive angles, G's, speeds, altitudes, fuel rates etc, everything, and also reproduce what is seen in HUD tapes entirely, including the way the aircraft moves and feels.