What are you saying people?!?! 1.328V is not too much for C0! I use 1.375V for 4GHz and 1.425V for 4.2GHz. With watercooling I keep it ~70°C / ~80°C respectively @ 25°C room temp.
Although, I agree that those are high temps for 3.6GHz even with aircooling.

@Wishmaker: try remounting/reseating your cooler, and check how evenly dispersed is AS5 under pressure. Think about watercooling.