Hi Clacy and Larry, Clacy has hit the nail on the head. You can play the "I will wait to buy on the way up" game only if you know what the chart will look like. During the decline jiggles and oscillations it's a different story.
If you can find a foolproof solution to the deep diver with AIM problem you get the Lichello Prize. But I fear it's like the search for the perpetual motion machine or an alchemy solution.
The best solution, for all practical purposes, is to avoid the deep divers by using ETFs, CEF and index funds. And even then you should diversify with several funds to minimize the risks.
Adam