I use streamers all the time for trout and steel. 90% of the time, it's slumpbusters.
I have found that using chenille bodies is the easiest way to add variety and color to your patterns. Yellow seems to be a killer color for big browns, so I often use that for bodies. I'll also twist yellow and brown strands of chenille together and use that.
Green and yellow twisted together with a strand of red twisted in near the head, with olive fur makes a great brook trout imitation.
As for the barb-
It's often hard to get the conehead on without crimping the barb. I fish barbless, so it doesn't bother me. If you want to keep your hooks barbed, I'd recommend getting a different brand hook. Mustads seem to be the worst for beadheads. Some coneheads also have a little notch on the inside for threading over the barb.