[Richard L]

It you are using a bigger nozzle, you trigger point with be tricky to set up. You may experience bogging down at low load.

I am surprised that the comany suggest making such a big jump of delivery change.

Aquamist do not make a nozzle that flows 380-420 cc./min. But you can use two nozzles - 0.6mm x2, exact size will depend on the pump pressure, which is unknown to me. I suggest you to continue to persuit the company with their suggestion.

Richard