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You hit the nail on the head regarding the gap between clean historical charts and live execution! The biggest real-world friction causing this divergence is slippage combined with emotional pressure during sudden volatility spikes.
When trading under prop firm rules like strict daily loss limits and maximum drawdowns, ignoring slippage can instantly breach an account. To separate disciplined risk management from pure guesswork, the absolute best metric is Expectancy (or Expected Value), calculated as:
`Expectancy = (Win Probability x Average Win) - (Loss Probability x Average Loss)`
A high win rate is often a vanity metric hiding terrible risk control if a single oversized loss wipes out weeks of gains. Tracking expectancy alongside your average loss and trade count ensures your edge survives live fills.
How do you factor slippage into your backtesting before taking evaluations? Share your methods below!