My prefernces in line are alot like yours. I use 10 lb. mono for cranks, topwater, spinners, etc. I use 6 lb copolymer for jigs and plastics (p-line cxx, which is more like 8 lb in most nylon monos). I agree his choice of line seems a little heavy, but everyone has their prefrences.
Some thoughts on the rest:
I think anything on a jighead is a jig. So as far as I'm concerned, a grub on a jig is a jig, and probably the best for swim jigging. So in essence I think when you're "fishing a grub" you are "swimming a jig."
Swimming jigs is something I really started to play around with last spring, and something I plan to do more of this spring. I was dragging my usual jig of choice one morning, a tube, and wasn't getting great results. A misfired cast had me quickly retrieving my tube to try again, when a smallie instantly hooked up. No big deal, I thought. I've had this happen before, and I too used to think it was more of a fluke than a pattern. But when I tried it again, just for craps and giggles, and hit another fish, and another, and another, I said.....hmmmmm...
Then the crankbait bite took off a few days later, and I put down the jig. I will be experimenting with it agian though, not just with the tube, but with grubs and hair jigs as well. Obviuosly swimming a grub catches smallies (though its a technique I don't use much), but I think swimming other types of jigs might be a viable technique as well. I think the power in swimm jigging may be that it's a mid-water coulmn, moving bait presentation with a different "look." Something subtle, not as in your face as a crank or jerbait.I hope to find out in a few months.