Thanks for the Floetrol tip. I should've mentioned that I had tried the product, but not in the maximum amount as you recommend. It started to look like an awful lot of extra material in the paint, and I held off a bit. Each time I mix up a container of paint I use a healthy dollop of Floetrol though.
The "Paint Easy" sample that came with the sprayer seemed to work very well, but I haven't been able to find a source for it now that the small packet is gone.