I am no expert when it comes to painting, but like you I've done a fair amount with reasonable success. I have sprayed quite a bit of DuPont Centari acrylic enamel with 8093S reducer and 793S hardener without any problems. I would suggest staying within the DuPont paint systems and using what they recommend rather than using these other brands. You may well have a compatibility issue in mixing these different brands. Remember too that the reducers are temperature sensitive and you have to match them with the temperature you are spraying in.
