I agree with "Mr.4speed" on using a faster reducer, and trying it on an upright test panel, this will allow you to see how far you can push the product without it running and give you an opportunity to play with , volume, air pressure and distance. Allow plenty of flash time and check your paint for flash by touching the test panel. Only recoat when the paint on the test panel is tacky and starting to set up. I would see if I can get a fast reducer, if you can you could tailor make a reducer that fits the temperature by mixing some of each together until you get the right formula. Painting in cool weather is a challenge, even for experienced painters and the word of the day here is caution. Good Post Mr.4speed.
I also agree with 302Z28, and if you don't already have one, put a filter between the heater and the outside air to minimize the dust getting in your wet paint.