You need to backtest in order to better understand the system. During this process there will be periods of performance and underperformance, and it's important to understand why and when the system works/fails.
One way of making the system continuously "adaptive" without adjusting parameters every week is to incorporate volatility into your stop loss and take profit targets. So for example, you could stop out 2 ATR away and take profit 4 ATR away (in whatever time frame you choose to operate). That way you can keep the period of stochastic (I prefer RSI myself) constant as the system automatically allows for greater volatility.
