While you'll find plenty of empassioned proponents of the 00 load in a 12ga.. remember that you're talking about kids here. Sadistic, dangerous, violent kids, but kids nonetheless. we're not talking about hardened gang-bangers, and making swiss cheese out of a 17yr old is not going to help you in court, regardless of the circumstances.
While I have NO, i repeat NO experience with factory less-lethal loads, it may be something worth doing some reading on, especially considering one or more of your would-be assailants may be a minor. Any prosecution lawyer with two brain cells to rub together will have a field day with that little fact..
While it wouldnt hurt to have mitigating circumstances on your side.. YOUR safety has to come first.
Just a thought..