Go down so that 70% Is showing and then you will have reduced the 100% by 30% .
Be careful on the tbr though and keep bg testing to make sure that yr basal hasn't been reduced by too much or not enough.
Have you lost some bodyweight recently or taken anything that might affect yr bg levels?
If not, then if the same tbr needs to be activated 2 or 3 days in a row, it will be time to think about adjusting either yr basals or your carb ratio and then see how you go.