Now that I've had my HVLP sprayer for a month or so and used it on a few projects, I have some observations. To those who use spray painters all the time, I'm sure they are of the "duh" nature. To those who, like me, are just learning the benefits of spray painting, I hope they'll help.
I've spent hours trying various settings on my HVLP spray gun. I've found that I don't so much need to worry about the paint feed speed, nor about the air feed speed once I got them set. Mostly, I deal with the angle of the spray (vertical vs. horizontal) and the width of the spray angle (narrow-beam or somewhat-wide-spray). I've found that the widest-angle sprays don't really cover very much. That could be a function of my compressor, but for now, I tend to stick with under a 10-degree spray width.