Well I think we have a pretty good idea Honus from those hand histories and text in the books by Rizen, etc. My take on it is this. These top guys are picking some good spots to chip up. These spots are spots that could result in them getting busted out--resteals off weak players, etc. They are playing a lot of volume so their goal is not to min cash--they take chances. Often I suspect this results in them getting busted out. But often it also results in them having a great stack.
As for why you would be worse now than before I think some of it may come down to what is a donkey...lol I've about come full circle a bit on what proper calling ranges are for certain situations. I was a bit surprised at what the "ideal" calling range was for certain situations in Kill Everyone. Basically its a wider range than I would have guessed. In the old days I didn't know any better and I'd call because I had two picture cards. The irony is that this is often correct.
But mainly I think they are doing things that your avg. good player is not doing--mainly picking spots to 3bet or shove--not necessarily with great hands. Plus once they get a stack they are raising with a wider range from position than the avg. good player, and post flop they don't give up--if they smell any weakness they will take it.
Also, I don't really believe in running good, running bad. Maybe it is the math major in me, but the odds are exactly the same for everyone each time the cards are dealt. Over time I don't really think it is possible to have one player be that much more lucky or unlucky as compared to another player. I can't explain why you seem to see this sometimes, but really I think it is about timing. Do you get the bad beat when there are 100 chps out there are do you get the bad beat when your stack is on the line.
I think it is only natural to have some bad results as you try new techniques that you do not have 100% ironed out yet.