"He who marches out of step hears another drum." ~ Ken Kesey
Couple of other techniques can improve the process. Think about it. What else besides off contact and pressure causes loss of tension?
Alan: Did you use them for discharge or plastisol? Any details on mesh count and coating technique?
Do you alternate the direction your coating on the single side (rotate the screen 180 degrees) or just keep it the same direction and coat again?