I think I experienced exactly what's going on with your prints and I know some solutions. I also use the gray and white resin a lot.
Problem 1; Sticky semi cured layer on parts with gray and white resin : These two resins are heavily pigmented. These are opaque as you know. This makes the post processing a bit harder. The reason you don't see this issue with makerjuice is a moderate pigmentation and translucency of makerjuice resin. if you use SprintRay's red or orange material , you won't get that built up layer.
Solution: Let your models sit in fresh IPA 90%+ for 30 min a least. Then blow the alcohol off and make it dry. If you don't dry it, it will stay sticky.
Problem 2 : Cured layer on bottom of the tank. This also comes from heavy pigmentation of those resins. The pigments settle on the bottom of the tank an will cure later or even fail your print. Again Makerjuice's resin is not that filled. So it won't settle. SprintRay orange or red should be similar to Makerjuice as they are not heavily pigmented.
Solution: Shake the resin really well before pouring in the tank. Wipe and stir the resin with a squeegee before every print to make sure its homogenous. You can actually see the built up layer if you wipe it before printing.
I hope it helps.