now i might not know what im talking about here, its happened before
but i think the slot 1 and slot 2 are for seperating the guns and may be set different based on their heights as mounted on the ship so you might not want to change those but i guess it wont hurt anything if you do.
just watch to see if you run out of ammo, each slot should have its own ammo so if they all share the same slot you may limit all guns to the ammo supply for just 1 gun
as for the gun elevation settings i think thats something that should be fixed for all stock BB