I weigh mine every time he sheds *if* he's also taken a big poo during the shed. Which he usually does either during or within a few days of shedding. I consider it his "empty" weight. I also record it in his notebook.

I keep track of everything, literally everything. weekly temp/humidity recording, prey weight/gender/if eaten, dates fed, dates shed, notations for when I clean up urates and poos as well as general notes on things I change in the enclosure, behavioral notes, etc

comes from being a vet tech and keeping medical flow sheets, but at least I have a very complete history if anything ever comes up lol. I imagine those of you with lots of snakes would not have the time without hiring a secretary