at the end of the day though it most fighters you've only got fuel enough for one, maybe two dogfights before you gotta go home, there's no huge advantage to being able to take out 5 planes with one load of ammo when you've got fuel for two, and besides, you'll have plenty of ammo back at base there's no use trying to conserve it, i'd use whatever it takes to get a kill because like you say, a kill's a kill and an ace's an ace even if he uses twice as much ammo per plane then other aces, eventually he'll get better...........
on a side noe that's quite a remarkable achievement.........