Good post on etiquette. I was taught the same as you that you start at the top of the run. Cast and step through. If you hook a fish, you pull out and start again at the top. Dennis Dickson has a good article on this on his site. I also was taught you don't fish down on someone but I must admit that if someone is camped below me, I have in the past crept down to maybe nudge them on through the hole.

(One other observation LT, I have found fewer people low hole me up at the Doublewide. Either it is not as obvious a water or they are two lazy to trek up there.)