pretty similar to what i use:
i just tie in 20' flouro line (not leader material) using willis knot for the spoon end. 20# is what im running. With your setup you have 2 extra knots with the barrel swivel. If your gonna leader below 20# then I would keep the swivel but if your not I would axe it. I only use spoons/plugs on leadcore b/c it doesn't get very deep.
I use a stretch of 30# big game on the backer end, alrbight knot to braid, for the release to clip to.