I have found the same thing, by layering shot and cardboard wads manually you add a few inches to the spread but it doesnt take a full choke and pattern it like a cylinder. I cut regular cardboard with a 7/16 punch in the drill press.
When using hard shot, a card, fiber or brush wad alone doesnt do much, at least not as much as often reported.
I found the stack of wads more effective than the x type.
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