I have been following your other thread on Skagit casting on the Grand with great interest. I too have been playing with techniques to move big tips in cold water with heavy flies. I have tried to employ Skagit techniques, but unfortunately I haven't encountered the success you have.
What I've found interesting is the question of backcast room. With my curiosity peaked I sat down tonight and rewatched the footage of Ed Ward at last years Sandy River Clave. At one point he talks about the need for more backcast room than he has available to him at the demo site, I assume due to audience in the way. He says he need at least the rod length plus a few extra feet. Did you have that much in the picture you posted or were you able to punch it out in tighter quarters than that ?
I ask only because I'm still in the phase of sorting out styles.