In the course of flying virtually every fighter in the set each tour, in the MAs and the TA, I have not unintentionally ripped off a wing in many years. Generally speaking, I don't see any need to pull more than 6g under most circumstances.
However, if a person's stick isn't set up properly, or it is spiking, it's easy to over-load a fighter.
If you are breaking wings, take a look at your stick settings. Add some additional damping and dead band. Adjust the sliders to prevent getting big control surface deflections for relatively small stick movements or displacement.
Above all, be smooth and gentle in you inputs. Don't jerk the controls. Slow is smooth and smooth is fast.
My regards,
Widewing