Yes the Universal clear can be shot at 20 psi. I even boost it to 25. I have been away from painting for almost a year now since I changed careers for a bit and now just painted a fender and boosted the pressure up to about 35-40 psi. I forgot this gun doesn't need that much and have to get used to it again.When I switched from the old Sata a friend of mine had (I can't even remember the model) and then his other "caveman" gun I call it I was so used to using higher pressure and moving quicker that it took me a while to get used to this gun. I am still getting used to it and love the gun.
How many turns out on the needle do you have it for Universal clear Shine? Around 3 I am guessing? Do you reduce your Universal any? I reduce mine a very little amount but really it doesn't even need it.