It is a simple question but I think answers and opinions will be different considering that some traders may fear further tampering with the strategy, others will no want to wait until it fails, what is your style?
There should always be room for improvements even in the best of things because situations can never be static same with the market. Only conservatives are afraid of tampering with the order of things and this leads to them being left behind when others are transforming and moving forward with current trends. Every strategy should be improved to give more profits that's what makes you a good trader.