I am happy for your acquisition, and the joy it has given you. I'd like to suggest the following:
Try a .570" - .575" lead ball (meant for a .58 cal rifle!) and a good cotton patch minimum .018" thickness. This will give you enough compression of the patch material to give a decently tight load, and enough cloth to carry lots of lubricant to give you no fouling issues at all, and respectable accuracy.