Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
I'd get a stouffer test from Saati to determine if you are exposing correctly. I know that helped us figure out our stencil durability.
We changed to 2/2 thinking it might last longer. We normally do them 2/1, but those only lasted about 25 or 30 prints. I will put a test strip on the next one but I don't believe they are extremely underexposed. We tried one at 10 seconds and it was hard to wash out the really low percentage dots. Will the hardener help and when should I apply it?