The card X-wads will absorb some/a little energy and return it to the pellets upon muzzle exit giving them a bit more sideways velocity. The over shot wads will act as disrupters to the shot cloud.

A resilient post wad will work better, including the lowly golf tee. Note also, that spreader loads should normally be loaded with the smallest shot needed for the intended target; #9 for clays but bigger for phez.

DDA