Continue to tiller your bow as usual, until you reach desired draw weight, at your desired draw length. Leave maybe 2-3 pounds to sand it out, depending on how deep your tool marks are.
Leaving your bow braced for a day of activity should not effect its performance, if it's made well.
To lose draw weight, you just need to evenly remove wood keeping your tiller the same. If you want 55#, make it 55#. Don't be afraid to continue to your goal weight. Your bow won't magically lose 10# by just leaving it.