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AB double-action gravity fed
.35 fine tip
Humbrol enamel
Cheapo white spirit thinner (turps substitute - what enamel thinners is anyway!!)
Ratio, by eye, as for milk, normally 50/50 (or 60 thinner, 40 paint, in rare cases.)
PSI - haven't a $%^%£$ clue !
With ya on that T....don't have a clue on psi
Ive never had a problem with anything other than water spitting out....
I occasionally get that too , bloody annoyinng and never know why it happens, or more importantly how to stop it happening