Doc,
I fish your favorite river as well. We run off the tail eye, split ring - barrel swivel - 6/0 siwash. Comparing it to back when they allowed the double trebles up there, I think our overall landing % is up, although the initial strike/stick ratio might be slightly lower. It just seems that once that 6/0 buries, they can't gain the leverage to unbutton due to the barrel swivel.
The one thing we changed to help bury the hook on the initial strike was to go to power pro 100lb (for up there). With mono, the fish's weight and strike are negated to a degree because of the stretch. With the power pro, if the hook point is anywhere near a lip, it will set very deep. This immediately became obvious when we were releasing fish. It took a couple guys working together to de-hook and release them in a timely and safe manner. The only issue we had was the 80-100 lb barrel swivels couldn't handle the stress of the inital strike with no stretch other than the 80lb mono shock leader. We broke a couple and had to move up to 200 lb swivels.
All in all, I'm sold on the efficacy of the single point. I would love to be able to run a bead chain siwash off the belly at the same time, just for fun. I think that combo would be very efficient (it is on the Columbia).