I have done some bucktailing, but I have done more top water fly fishing where the fly or "popper" is moved through the water on the retrieve. I know this takes out of the equation the prop wash, but I have found that a solid "V" wake mixed in with some "ruckus" from the fly, brings on the most strikes. I put the rod under my arm, and do a two handed retrieve as fast as I can manage. When you see that big bulge wake coming at your fly, it is a heart stopper! I have a friend who is very successful using a this same retrieve with a fly just below the surface.
As far as optimum speed- mess around with that. The one thing that I have discovered about top feeding salmon in Puget Sound, unpredictable! They will take a falling fly, a fly on the swing, a "dry" fly, a popper, a fast retrieve, and a slow retrieve.
Did the article include information on "skipflying"? That sounds really interesting. You trail a fly super slow, just barely making a "V" wake, just behind the motor. Sounds improbable, but I guess it works in the right conditions. I think the BC fishers do this more than we do. Maybe one or more will give us some first hand experience with bucktailing or skipflying.