[kchaptergphib]

I agree with Gator.. above. It definitely sounds like your panhellenic council needs some help.
And I know social probation is a HUGE deterrent. No one wants to be the reason their chapter cannot participate in a semester's worth of official activities. And this way, NM's who were successfully dirty-rushed, and did not notify anyone because they liked the group and/or the special attention, bear the consequences as well as their new chapter.
It'd be like, "Well, let's see, for this serious of an infraction, you do not get to participate in Greek Week, and you are only allowed one formal instead of two, and you will be fined the amount that you would have spent on your second formal and Greek Week= $10,000."
I think a lot of us here agree that we've seen consequences of social probation work well in the past; so good luck in your circumstance. And work on getting total lowered!