In order to produce accuracy, the patch/ball combo has to be tight enough that the pattern of the patch eweave is engraved ontop the ball, and the land marks must also be visible. The smaller the ball and the thicker the patch (or in yoiur case, patches), the less likely this is to be true, and the more gas will blow around the ball through the patching material.

I suggest you "bark" your squirrels, rather than try to use a ball that is too smal to be accurate. "Barking" is what D. Boone, et al did-you shoot into the tree limb or trunk just under the squiurrel. Either the shock from the close impact or the fall will kill it!