Good shooting Cayugad. I think with more load experiments you'll get things to come together much tighter.
You're right about the muzzle being tight. For some reason, when i had that traditions evolution inline, #11 caps always gave me a reverse crud ring. I got it at the muzzle rather than at the breech plug end. That was with pyrodex though.
Why dont you break out one of them traditions sidelocks and give the JSG 3f a go with some round balls? I really like this stuff in the sidelocks.