I don't know how you did it. Better Pro Am is dynamic and no fixed average trade sizes are coded into the indicator and there are no parameters that need to be optimized. The Better Pro Am indicators use a proprietary algorithm to analyse average trade size and identify Professional and Amateur activity. Since Professionals trade in size they need to buy new lows and on down bars and sell new highs and on up bars — before the trend changes.
Professional activity can be used to identify market tops & bottoms
Mark L. Stopping Volume and Profit Taking show Professionals are reversing their positions.