@Tomahawk Taxidermy, when the patch is either cut making a hole in the patch, the patch has multiple tiny holes where the lands have cut the patch, or the patch is shredded is an indication that gas cutting is occurring. This means that pressures on the ball are not consistent. When loads are not consistent, accuracy suffers. Cutting of the patch means something sharp is cutting the patch. A circular cut is indicative of a sharp crown. The tiny holes indicate sharp corners on the lands. Shredded patches indicate that the patch is too thin, or the patch material isn't robust enough to survive the firing. A well-matched ball and patch will result in a patch that is intact after firing. Holes in patches should be corrected by smoothing the crown, smoothing the edges of the lands or finding a better patch material or lubricant to use.
A little bit of excess patch doesn't hurt accuracy. One does have to watch for too much excess patch can catch on the loading jag and pull the ball away from the powder making an unsafe condition that can bulge the barrel.