I think your paint / por quantities are higher than they need to be. I did long fleetside and used 1/2 gallon of house paint. It went on light after por.
Por - i dont recall specifically but i dont think it took over 1 gallon. I applied multiple coats of both, but dont recall how many coats. That was 12 yrs ago and it is a strong finish. Gets hot in the sun, but that is the only negative.