A tight stop will produce whipsaw losses in trading ranges. Even though each loss may be small,the sum of a series of losses can be larger ! However a trending market will rescue a system with tight stops and results are astonishing.
A loose stop will prevent whip-saw losses in a trading range but will have large drawdowns as well as poor RR ratio. As we loosen the stop, more of the winning trades as well as losing trade from a false signal can survive longer.
Helps to bypass the magnet effect of stoploss. Often, the stop acts as a magnet for prices. It seems the market hits the stop, only to reverse and resume the previous trend.
A same dollar stop on every trade may be too tight or too loose.
Your back test data of stock you decide to trade. Once you start loosening from a tight stoploss ,the profits increase and then change more slowly and when you pass some volatility threshold, increasing the initial stop adds little value.
Always try to take the long-term view when you set your stops.
The risk of being stopped out is highest near trade inception . Hence its okay to try once again but never if stopped out twice.