McClellan Oscillators:
There is an inherent flaw with the McClellen Oscillator. It is the same flaw as Bollinger bands, MACD, Stochastics, and many other popular TA indicators. They all tend to use arbitrary, fixed time periods instead of ones which match Hurst's cycles. Cycle periods will vary. This is why these other TA approaches will tend to be less reliable than Hurst cycles and Elliott Wave approaches.
Once a hurst cycle has been determined, however, these TA tools start to have more value in confirming cycle lows and wave counts.