Congrats on the new bp!
An adult mouse sounds fine for that size, or a rat pup. You can go by the 10-15% rule: feed a feeder that is that percentage of your snake's weight if you're feeding f/t.
I say if your handling makes it to where your snake goes off feed or is constantly roaming the enclosure then it would be time to cut back handling. Handling here and there is fine for most bps: some are more tolerant of handling than others.