1.32v seems high for 4.7 on all cores. I would try to lower the voltage, maybe try 1.25v for an all core 4.7 OC. TBH it should be able to go lower then that just make sure that u arent experiencing too much vdroop and if so increase your llc.
also, which stress test are u using? Prime95 will put the highest demand on your system but it is not very realistic i think. try aida64 or realbench to test your setup.