I am glad to hear you had a great first visit and were able to ride AlpenFury! I got my first rides on AlpenFury on Monday and thought it was insane!
As for a chaperone policy, there is not one at the park. I wish there was one in place, as I too (as a regular), have seen many teens being disruptive and rowdy during multiple visits over the past three years. That behavior does kind of take away from the experience.
Hopefully you're able to come back soon!