I use a damp patch between every round. It just makes the residue soft, and hard scale never really builds up. I can shoot 30 rounds and #30 feels like #2. Same resistance. Again damp patch, not wet and dripping. That might block ignition. If I feel the bore is too wet, then I dry patch. I guess there is a price tp pay, if I get the bore too damp I'll get a misfire.
I also do a pretty good flush before I leave the range to get 90% of the carbon out. I clean the rest at home with simple green cut with water. If it will sit, the I finish with balistrol.
Maybe I should add I only use blackpowder and flintlocks.
