I just ran into this myself. 1 fluid catcher filled these 3 tanks in 1m20s, that's 7200L of fluid in 1m20
7200/1.33 = 5400L/m
So they have a throughput 3 times what the game says they do
The space pipe is known, their throughout limits are planned but not implemented
The bug here is that the catcher is also not limited them it should be