hey mopar,
have you tried the fast drying clears by PPG ?
Try the DC 3000 or the DC4000 . They mix 4 parts clear , to one part catalyst , no reducers needed .

I tried it the other day , and liked it , 10 minutes at 140 , let cool for 15 minutes and buff . Beings you dont have a heat makeup booth and in a cold environment might be right up your alley . Worth a try .

SprayTech