a noble endeavour, to be sure, i look forward to seeing what you come up with.
if larry's gain percentage is derived from his position size, then unless you're talking about positions so small $10 commmissions have an impact it would seem to me that you have what you need. if it's +5% on a portfolio of unknown size and the positions aren't 100% of the portfolio, then i guess i'd agree more information would be useful.
i'm curious, what do you do with people like me who have signals that DO have a clear exit plan in case things go wrong but that exit plan is not defined in terms of a numeric stop loss?