I've tried both 12.1 and 11.12 with SDK 2.1 now and it didn't work... Still 50% load on the CPU and still fluctuating hash rates.. I'm really getting tired of this **** and I'm about to give up... And before you ask, yes I used Driver Sweeper to uninstall the drivers.
Maybe I should try a different miner? Highly doubt that'll work either though..