That is exactly what I do. My ammo processor runs almost non stop and dumps it all into storage up to 1k and the schedule only lets it depart Nauvis at 750 and other planets at 500. The difference here is that the other planets have passive medium asteroids which slows down effective ammo generation, so I would rather be idling at Nauvis if I have to. I tried having less turrets but then bad things happened which set me back a bit...