Mike,
I would have to agree with your approach, as it makes tons of sense to average into your winner, and that you BE most of the time, then hit a home run. From my journal notes on my swings, I have made similar comments.
For now, however I have lots of buying power, so I look to have open at a minimum 10 positions (both long and short), but find that the more positions I have open the more money I make. I have a ceiling based on a basic % of my equity for all open positions - to give me a max number of positions.
My targets are tight, as are my stops - hence the win rate is what has generated a positive expectancy of the swings over the past 4 months.
I might over time however, change around my swing towards more of an approach like yours.
Once again, thanks for sharing and I look forward to taking more notes on your comments and insight.
Thanks,
PatrickQ