Not sure to understand what you mean by your average road target higher than your target ROAS. Are you changing the ROAS target during the frame period of time you are looking at ?
If you’re current ROAS is below you’re target, it depends if it’s the case during all the time period, only actually and not before ? If you are happy with the current ROAS despite it’s lower than the ROAS target, you can lower a bit.