I just got off the phone with their paint tech.
I asked him what they would consider an over reduction for a "flow coat". He said it's all preference, but normal reduction would be 4:1:1 (paint, activator, reducer). Over reduction would be 4:1:1.5. He also mentioned you would make your clear passes fast with the over reduced flow coat. If you get a run, don't worry. Sand it out and lay another coat.
I also asked him whom manufactures their paint. Is it Kirker? He said, "They get their paint from a sourced out manufacturer who's been making paint for over 150 years. People have been making guesses from PPG, Kirker, Sherwin William's, etc. I can't tell you who it is though."
Seemed like a nice guy and knew his stuff.