You don't need much for volume of air or high psi.
I run mine ~1/2 psi or so.
This was recommended to me by Smalljaw and it seems to work the best.
Yes the paint build up is normal on the tip.
You can use plastic grocery bags in a box to catch overspray.
I switch colors often enough I don't bother.
I save it as a color called kitchen sink and will find a use for it someday.