there is a comment by jjrvat that caught my attention.

"What is the average true range of the waves in a 500 VOL YM chart? What about in a “perfect setup” WAVE? In what % of these ranges are your targets? Stops?. What are the probabilities (in your experience) of having a good trade when you respect your PBP? And when you don’t? what about drawdowns?".

Price are dynamic... hence the shortfall of trading with Indicators using fixed value. Observing price, one can often see how price minic it's previous move. At times, it dance with small osc within the "normal" move. Need more observation.