Cris, no problem at all this, has nothing to do with spi, so I offer them help, and it works, or it doesn't..
Im not writing a 20-page explanation, so read the part where I proved some of their points and think about it.
When a professional painter calls me with one of the following problems, what is the first question I ask?
Orange peel
Runs
Flash is too long
Metallic with quality base, problems.
Clear is cloudy the next day
Solvent pop in the first coat of epoxy
Solvent pop in 2nd coat of clear
What is air pressure at the wall set at?
Why is the answer 9 times out of 10, 70 to 80 lbs?
If 125 at the wall or higher, then we go to the next question.
Like I said, net results all we care about, so if your way works, don't change it.