A great example is my recent X puts. I bought a batch at @ 3.10, then another @ 2.10. Soon after the second buy, the bid-ask was something like 1.65-1.80 at one point (which would have triggered a 40% stop on the initial batch). I held, and later sold both lots at 3.10 for a 23% overall gain. I count that as one win of around 47% on the second batch, and a loss of transaction costs on the second batch. Had I stopped at 40% loss and ended the same way (i.e., held the 2.10 batch until 3.10), the overall trade would have been an overall -2% loss.

I repeated that pattern several times, averaging down on puts and calls for AMZN, SPY, NDAQ, BBY, etc. A tighter stop on the X trade would have stopped me out of both trades for a 20% loss.

My strategy would be totally different if holding stocks though, or in times of more normal volatility. I would then go with tight stops and be satisfied with a 40% win percentage.

3:1 is crazy–even factoring out the 15 in a row at the start, it's still about 2:1. The only thing I can say is that I was short on 85-90% of my trades during a time where there was a 30%+ drop in the market, so execution had little to do with it…it was primarily due to being on the right side of the trends.