When you mentioned "waves" I always consider Elliott Wave Theory...but when you , mention "extremes" or "exhaustion levels" with a perfected scientific agenda like Tom DeMark, I think of of DeMark Indicators...both have been used for more than 30 years and possibly way too much.
I like a little of both...but bear in mind that most hedge funds have adapted to them, hence sometimes they don't work.
I use the 8 to 9 day exhaustion for a short term stopping point only...I hate waiting for the 13 count completion lol...
Actually we had a guy named Rick Bensignor who worked for Morgan Stanley "upstairs trading for corporate account"...he wrote a book:"New Thinking in Technical Analysis" and covered both Elliottwave, Tom DeMark and others John Murphy, Steve Nison, Linda Raschke, Peter Eliades, Larry McMillan, Larry Williams, Bernie Schaeffer and others...good references with different approaches...
