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I tend to water GW paint down a lot, but that is more due to it being old and thickened up some what.

I'd suggest trying around halfway between watery and paint consistency,

Watery - is put a dab on a vertical surface and it will run straight down
Halfway - initially sticks to the side but the majority will start to run off within a few seconds
Paint - sticks to the side with a very slow run off

I then spray at anywhere between 10-25 psi, usually 20 as that is my default and I'm lazy.