ah right. ok. i see where you are coming from..
when it comes to tinkering with strategies, the one i like to employ is improving the win rate. its always easier to trade a 70%+ system, than anything lower.
i once came up with a <10% system win rate. tried trading it for a month. didnt last!!!!
im always happy to forego an overall bit of profit, in terms of increasing the win rate.
again this has to do with psychological reasons..
a tip for improving the win rate of most systems...
remove the bad trades, or even the 50/50 trades.
eg if you have a system that overall has a win rate of 65% , if you then find a common pattern in those trades which only is correct maybe 50% of the time (but might still generate a profit) , then exclude those trades from your overall method. then bingo your strategy leaps up a few %, and saves on transaction costs etc...
another way to increase overall profit is to find a similarly accurate system, but which trades from an uncorrelated set of rules. then disregard trades signalled in opposite directions by both systems.
again this will boost the win rate, and profit per trade...