spacing
Personally I think it is hogwash, but each his own.
I started shooting these back in late 70's.
bought two factory kits Navy Arms 1858 NMA 44. Filed, sanded and fit them.
Went to the neighborhood makeshift range. Just an area about mile out of town where everybody congregated to shoot. Targets? whatever. Paper, bottles, can, silhouettes, gongs, whatever you wanted to shoot at.
I loaded the factory recommendation 28 gr fffg. settled on 30 gr over the years. Filed the sights a tad to gain consistency.
Then as in any other tool LEARNED HOW TO USE IT!
Which meant and means, learn the point of aim for the desired Point of Impact.
Mine with a benchrest, Aim dead center on the bulls eye, usually at least clip the edge (1" dia bull) at about 20 yd.
Another thing we did years ago. Drive a desert road about 5 to 10 mph. aim out the window at bottles and cans in the ditch. Over time got more hits than misses.
Your stuff of filler and ball spacing is a bunch of hooey in my opinion.
Load enough powder (around 20 gr fffg on average) you don't need filler.
Learn where the gun shoots (fun or competition).
Wad or not. Wads are not a necessity, but they can help reduce the fouling and when lubed can help soften the fouling. And over ball lube is not a necessity to prevent cross fires if you load correctly to begin with.
35+ years, numerous different BP C&B revolvers have never had a chain fire.
But like I said this is just my opinion.