They would fit in Nsa they wont be that op with hydras around
Guns in hover mode is much deadlier than rockets. I do rather suggest to add hunters and disable its guns. Using rockets only. As hunters are the fastest helicopters in SA so this will equalize the combact with hydras on the other side.
About the guns l described above, the only way to do it is to disable it completely so that it won't fire or disabling the effect of guns on enemies fired from hunter.