What brand of fiber cushion wad are you using and how do you lube it? If they are circle fly, I would try something else. Precision Reloading has their own house brand which is much better than Circle Fly. Ballistic Products also has some other options, but there is not a lot of variety out there.

I would try 2 nitro cards, also.

How do you seal the ends?

Last, someone here, long ago, suggested using a paper wrap around the shot. I use some water color art paper which is thick and will easily and greatly reduce barrel scrubbing by the shot which gives fewer fliers.

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BrentD, (Professor - just for Stan)
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