These days I stay within about 5 lbs above or below by weigh in weight. I don't vary more than that because I don't need to be lighter even though my screwed up brain sometimes thinks I need to be lighter. I don't need to be heavier than that because I'm not going to move up a class, cutting too much weight for a 2 hour weigh in sucks, there are now a bunch of technical reasons I don't like to "feel" too different in training, and I need to be a smarter lifter more than I need to be a heavier lifter.
A large cut for a 2 hour weigh in is not fun, and it can add a whole new level of stress that hardly anyone needs to add.