Do you find they foul that much less when you tie the pattern back on the shank like shown in the pic? My buddy and I debate that. He loves stingers, and based on his success, I can't really argue with him, but I've been on the fence about tying the pattern back like you do.
Yeah, they foul a lot less for me; of course that may have something to do with my casting rather than the fly. I like to tie them back and then epoxy or Softex the entire head area plus about a quarter of an inch off the back of the bend into the material hanging off the hook. Keeps the front stiff and from wrapping around the hook, but still allows for plenty of movement on the back part of the fly. Plus, I weight these patterns underneath so they dip and dive more than a similar pattern without a little weight. For salmon, especially chinook, I haven't found the need for a stinger, even on big flies. Some people say that is because a chinook almost always takes a bait at the head, where a coho will attack the bait from behind. Not sure what the truth is, but so far it has been true for me. Also, I would use a hook with a shorter shank to begin with, I just didn't have any with a large enough gape that were also short!