Nice tips Mike.
Mark, I've noticed that with your flys, the hook eye is closer to the bottom of the head than the top. This is how I usually do a popper or floating bug, to allow for a wider gap for a hook set. In the videos in your post, the Tyer places the hook eye closer to the top of the bugs head. In the second video he points this out, but does not explain why. He does explain how he places the body on the hook so the taper of the body allows for a wider gap. I wonder why he places the hook eye so high. May it allow for a more aggressive popping sound, as he likes to work this fly more aggressively? Any ideas? I have never placed the eye so high.