GBP/USD Daily Breakout

I propose to trade the GBP/USD on daily charts.
Method seems to work on examining historical daily charts but reality somewhat different.

Entry daily high plus 12 pips (5 digit broker)
or Entry daily low minus 12 pips
stop loss 100 pip target 100 pip

previously tried with 9 pip + - hi/lo but got whipsawed out.

Any suggestions on improving stop loss?

How many times have you hit your 100 pip stop loss compared to you 100 tp

My suggestion on a stop loss (and TP for that matter) is to not use a static value but instead to set it based on the market conditions. You need to consider the volatility and keep an eye on support and resistance, and also round numbers.

It is alright to start with the idea of a fixed value, but don't place that stop without looking around on the chart first to make sure it makes sense within the context of the recent price action. Could save you a lot of burned fingers!