fathom - 9:55 am on Sep 20, 2012 (gmt 0)
Its hard to prove 100%
It also important to note your own history and strategy design.
You appear to have the same problem(s) since you started posting here (3 years ago... reviewing your post history).
I'm not privy to you data but maybe your strategy is flawed and not the competition.
You can certainly prove anything impression/click oriented with your own log files... which begs the question - why are you still guessing?
If you have doubts... get a log file analyzer to identify reoccurring patterns.