Getting the swab all the way down and twisting it in that position should take up most of the crud, especially if you're doing it twice. Use a nipple pick before reloading to make sure crud hasn't been packed in the flash hole. Use it again after loading to make sure the spark will have a clear path.
I've shot mine 50+ rounds and there was some crud when I pulled the plug for cleaning, but nothing excessive. I could probably have shot another 50 rounds, but I had run out of wet patches and things were starting to get a little sticky.
Oh yeah, removing the plug for wet swabbing while at the range & continuing to fire would most likely wind you up with a lotta crud in the threads, a plug that won't screw all the way back in, or the kind of baked-in, burnt fouling crud that makes subsequent breech plug removal nearly impossible.