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The Williams Percent some times does a peak per the info on the website. Try a number lower than 14, say 11.

An interesting phenomenon of the Williams Percent Range indicator is its uncanny ability to anticipate a reversal in the underlying security’s price. The indicator almost always forms a peak and turns down a few days before the security’s price peaks and turns down. Likewise, Williams Percent Range usually creates a trough and turns up a few days before the security’s price turns up.

http://ta.mql4.com/indicators/oscillators/williams_percent