I have some .005 patches and they work fine in the T/C .56. I find them still intact after firing. Still snug with the .550 ball, but much easier to load then with the .010 patches. The .005 patches can be found online/mail order, but rarely in local stores, in my experience.
No doubt the smaller ball and thicker patch is fine, too, but I just like using that full 28 gauge ball.
Sam