It sure seems to me you are making a simple job as hard as possible. Did you try to get one of the Sam Fadala black powder books I suggested?
You really need to find somebody to give you a hand.
Buy this book. It will answer your questions. Even the ones you haven't thought of yet. I almost gave up on BP because I couldn't hit anything with my gun. I found out I had a patch problem. Once that was corrected I was shooting great groups with a gun that went off just as fast as a center fire gun.
https://www.ebay.com/itm/The-Complet...item1edb9067cd
Good luck. I hope you get this figured out.