Three months for a shed in a young snake, gee...that IS a long time!? I don't remember my bull or gopher snakes taking that long. But I wouldn't worry
about it. I never had bites from my bull or gopher snakes either...& hisses were uncommon; these snakes seem to "catch on" pretty fast. "Angry eyebrows"
don't mean much, lol...like rattlesnakes, they have scales above their eyes that shade the eyes & give them "that look".