I saw this strategy in the FX magazine and seems interesting the author of the article explained he used this strategy to filter the market and not overtrade. I added the Hawk Eye which was made by Lazy Bear and is excellent to clarify the side of the market. I also use the Bandwith ( which is the difference between the upper and lower band, BandWidth decreases as Bollinger Bands narrow and increases as Bollinger Bands widen ) to measure the size of the move over time, the higher the volatility the higher the returns in a short time span.
Everything else is on the chart, fell free to comment and ask questions !