Try this:

--20# test backing
--100' flat mono running line (or use 2wt flyline)
--12' floating belly section...8 wt or more
--11wt type VI sink tip

I've found a floating belly section acts much like a strike indicator...and in slower deeper holes the weight of the 11 weight type VI sink tip is enough to pull it under the water, allowing you to cover water deeper than most premade sink tips (although I haven't tried the Versatip system). I'd try to find heavier sinktips...in a 10 or 11 weight...while an all floating line might be okay for general summer and low flow use, I'd switch to a belly section and nuetral running line to get deeper quicker in heavier flows.

Amazing thing is, the last time I was in to H+H sports in Bellingham they said they "didn't carry" sinktips...while I really like that shop, I had to go to Skagit Anglers in Mount Vernon to find decent tips.

Sharp hooks!