I realized that if I had stretched the trade to one more position in that previous chart, instead of having 8 wins and 9 losers, you would have had 14 winners and 3 losers.
Win/loss percentages would apply to complete trading systems (i.e. not to individual indicators which can be used in loads of different ways). Not that win/loss percentages alone tell the whole story anyway. They're used with hugely varies settings. Depending on how you're using them. Most people I know who use them aren't doing so in ways at all similar to those originally described by John Bollinger.
read the book Bollinger on Bollinger only market structure can be perfect ..no indicator can ever be perfect because all indicators have only one look back period while you and your eyes have variable look back periods. you can read momentum by comparing various swings visually....Toni Hansen gives an idea of how to do this just search google