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Those don't look like air bubbles on the painted surface -- they look like little gobs of solid paint. But I can't be sure from that small picture. If it's paint gobs and not air, it means the sprayer isn't atomizing the paint well enough.
Sprayers have a hard time with most paints. Lower end sprayers don't have enough power to do a decent job. Those who spray regularly use a 4 or 5 stage turbine for paint. I think it's likely your Wagner isn't up to the quality you are looking for.
If those are little gobs of paint, they can be filtered out. I filter everything as it goes into the paint cup after thinning, etc. - no exceptions.
I also use a little Floetrol to help with leveling, about half as much as is recommended.
It's likely not a filtering issue. There's no detritus. Just larger droplets. Underpowered sprayers just can't make all the droplets fine enough in thicker liquids.
My wife is spraying cabinets with an airless. She got a fine finish tip and has been great. Paint from a professional shop for gun application. She did have some air bubbles just as you describe and felt it was too much pressure and the gun was too close to the door. Think it went away after that. Jeff Jewit (spelling may be incorrect) has a fabulous book for spray painting. Guns... 2-3 or three stage can do it with paint but 4-5 stage are much better with thicker product. Lastly consider borrowing a friends sprayer to see if it makes a difference.
Have you considered using a water-borne pigmented lacquer like Kem Aqua from Sherwin Williams or M.L Campbell? I use a Fugi HVLP with a 1.8mm tip with good results
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