Unfortunately, this is partly due to how the base game handles spawning enemy bases.
I simply use the base game interfaces to say "Start spawning these spawners at a distance of 5", at distance "5" (whatever that distance actually is, I don't know) you start seeing my spawners showing up... but then you go a bit further, and there's more and more of my spawners and fewer and fewer of the base game spawners, until it's only spawning my spawners.
I could set it to just spawn mine from the start, but it's intended they only start to show up further out.
In theory I could re-write how the game handles spawning quantities, but it's all written in the "new resource spawner" logic, and half of that is jargon.