I've also had a couple of my young ones go through a grouchy phase when they went through a time of rapid growth. Maybe they were extra hungry, maybe I was feeding them large enough prey, but upping their food (bigger prey items and slightly more often) chilled my guys out. The one guy in particular would even strike at the tank side when I walked by (when I kept snakes in tanks). He out grew that though without any interventions besides a bit more food and some space.