My final approach is a similar practice. Wipe down with W&G in stages until there is no residue, let it dry 30 min. Light tack and spray. I have also run the ball filter in the past, I was talked out of it by my paint reps. To eliminate variables I put my paint in an aerosol container and it came out just fine.
When I painted the truck I used desiccant and a filter and it worked fine.
When I painted the BMW I used a different drier which is now on my machines. I had no issues
I picked up this little drier second hand and it may be the issue. The problem is that I think it contaminated the lines too. I will pick up new lines and some filters tomorrow and try it out again...
On the plus side I am exactly where I wish I had been this morning in terms of set up. Car is taped up, staged, and ready to go. Wax and grease, light tack and then its time to spray.