I haven't used a nymph system (bobber/floating line/weighted fly) for steelhead in a long time, and usually only on small rivers/streams like the tucannon, which you can jump across in spots. I use them regularly for trout, but not for the big boys.

I usually use an interchangable tip system. Type IV sinktip most of the time, 12-15 feet, short leader (maybe 4 foot max, 6 foot for super clear water) and a weighted fly that will sink about the same rate as my tip. It doesnt do much good if your line is at the bottom, but your fly is at the top, but what do I know?
I am just bored at work, and happen to be the first guy to reply..... wishing I was fishing. Steelhead season closes tomorrow and I am about to drive up and camp out for one last chance at some chrome metal.