New poster, long time reader.
I ran into consistancy issues using the adjustable disk with unique and light charges. It got better with the fixed volume disks, but I still had "flyer" charges that would be a little lighter. Lee's q&a website section lists static in the plastic as a possible cause for this. With that in mind I made an aluminum bushing that had the I.d. I wanted for my charge and an O.D. That was a light press fit in a larger volume disk orifice. Much better plus after making a couple more I can have in-between loads I couldn't get to with the standard lee disk sets.