Will increasing spawn area increase guardian spawns? [1.11.2]

Question

I've been building this Guardian farm on a Multiplayer server.
I cleared out all the water and removed the temple itself.

Then, I built the glass box in the middle and filled it with water.
Guardians do spawn a bit, but I want to higher the rates if possible.

And yes, I have lit up all nearby caves.

So I was wondering: will making the box bigger affect/improve my spawn rates?
Or does every temple have a set amount of spawns that will be concentrated if the spawning area is smaller than the temple monument.

Thanks.

Screenshots

Answer 1

Increasing spawn area will increase spawns.

If you increase the spawn area, spawn checks that would normally fail will now succeed, but at a certain point, there will be so many guardians spawning at a time that more will be unable to spawn.

Answer 2

It wil have more than double the spawnrate if you put a roon on it. No direct sunlight is the key.