How soft is that gray wadding? From my perspective, I would think it would act like a cushion causing the ball to just poop out of the barrel. I remember when I first started loading shotshells, they were paper with a thin paper wad over the powder and additional wads to bring the shot colum up to the top of the shell for the star or roll crimp. Plastic base wads were just starting to be used and then the modern monolithic plastic wad and cup came out. It seemed like the light loads where I used to use a couple fiber wads along with the base wad wouldn't have the "oomph" or recoil that shells with a minimum of wadding had. Don't know if this helps, just thinking out loud.