You’ve gotten some great advice by some of the best out there. I’ve been shooting Frontiersman for the last 4+ years at first using Remingtons, then ROA’s. Your load looks good, since I hate to carry extra stuff to the loading table, I use the back of the Polish Capper to make sure the nipple is seated, one less thing to remember or forget. Here’s a couple of things I’d suggest, put nail polish on the chamber you don’t load, I also put a little piece of rubber over the nipple to that chamber to keep me from loading it. When you clean your cylinders the nail polish comes off easily and you can then rotate which chamber will be the no load chamber for the next time. Another thing, since I don’t charge my cylinders the day before, I use a grease cookie over the powder/under the ball, it’s been shown many times that grease over the balls blows all the grease off after the first shot. Doing this pushes any powder that’s on the chamber wall down, chain fires come from the front of the chamber not the back.
Another thing you might want to check your mainspring, ROA’s aren’t known for spring issues but if the main springs are wearing out you’ll start getting light hammer strikes.
Welcome to the world of Frontiersman, and remember Keep your powder dry, your nipples clean and your balls tight.