I have to ask, why are you anti skid plate???
If you are running anywhere but the dunes/track or street i would say you are nuts not to run a rear skid plate.
In my opinion, it doesnt matter which brake rotor you put back there, and how tuff they claim it to be, without a skid plate you will continue to bend/break rotors.
Also risking fucking up your chain and sprockets and the worst cracking your cases if the chain breaks loose.
Just get a damm skidplate and get there and smash that thing..