Help! I am subbing for a couple of weeks for a middle school math class at the end of the school year.?

I am filling in for a teacher who will be out for the next 2-3 weeks, and I cover five 7th grade math classes per day. It's a bad time of year for kids to be unruly in the first place, but I have one class in particular that is absolutely out-of-control unruly. There are 6 students who continue to disrupt the class by talking and getting up and walking around even after several reminders to nip the conversations and to stay seated. They also suck even the good kids in by doing goofy things that makes everyone laugh. Added to this bad situation is the fact that there is a paraproessional in the class that works with a few sped students. She has zero tolerance for any talking, which is unrealistic. It's a clash of teaching styles since I believe discussion of answers is helpful, whereas she wants total silence. I think some of her intolerance causes students to act out more. I have talked to the para and she seems to feel that I am too lenient (even though I have given lunch detentions, time out room referrals, and notified the VP). Oh, by the way, the teacher who I am filling in for left a stack of "time out" and detention forms already filled out with the same offenders names!! So it is NOT just me. I have been teaching for 7 years and I have exhausted all my ways of handling this. I have NEVER had a situation like this. At any rate, I hate dealing with this class on a daily basis (I have a migraine every afternoon) and I am hoping someone has a method or two on how to deal with super unruly middle schoolers who have a long term sub at the end of the school year.