They are muzzleloader original 1/2” preluded fiber wads and the ends are sealed with clear gorilla glue. The nitro cards and overshot cards are both circle fly 11 gauge cards. They still seem fairly loose in the hull, and these are virgin hulls. I’m concerned they will be too loose on fire formed hulls.
The overpowder cards need to be tight and more of them will probably help quite a bit also. You may find it easier to use plastic hulls to get better wad/hull fit. I use CF nitro and overshot wads, but not their cushion wads. I pressure tested them with nitro powder, and they failed miserably. I am not familiar with "muzzleloader original" wads, but if they are like the CF cushion wads, I would look elsewhere. I lube one of the two nitro card wads with beeswax or BP lube, but not the Precision Reloading cushion wads (doing so really increased chamber pressures).
I also use an overshot card UNDER the shot to prevent pellets from embedding in the cushion wad.
GLS has taught me a few tricks about loading nitro fiber ammunition and one of the most important tricks is to use a good bit of pressure on the wad column. I made up a tool that will put about 90# or a bit more on the wads before I add the shot. It greatly improved the consistency of the loads from shot to shot.
Last, I again recommend the paper wrap. You might even consider cutting the shot and compression sections out of a plastic wad and using that, at least to see if it helps.