A lubed felt or cushion wad is a shooters own choice ,personally I do find that they are unnecessary all I use is a 1/8 card over powder wad, and a 1/16 overshot card wad,this is all I use when engaged with pest control and shooting big bags,this can be 100 shots or more per outing. A coked barrel will shoot better the only time you will need to remove fouling is when you have difficulty in ramming home the wads.
If a lubed felt wad is used it should be between two card wads other wise it will blow your pattern ,it can also become a projectile if shot is forced into the felt wad, this will travel a greater distance than shot,I have seen both wing and ground game shot in half when this occurs.
Feltwad
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A Flint Lock will not secure a chicken house door