Hi man (I’m Brazilian too). That temperature at that low load really can’t be right, even if you were using a default cooler. Your 360 should be enough.
Please, don’t get me wrong, but check if there is no plastic film between the cold plate and the CPU heat spreader. Even Linus Sebastian (Linus Tech Tips) admits having done that at least once.
Also make sure the water pump is running and has no air bubbles stuck on it. That is the problem raised by Gamer’s Nexus that caused quite a fuss in the community a few months ago. In that video he suggests that placing the pump above the radiator may cause bubbles to rest in the pump, making it not work and even dying. It is not a sure case, since my pump is above almost all other components and I haven’t this issue. Stephen also states it is just a recommendation. Installing the pump above the rest of the loop is not guaranteed to cause the bubble issue. If you have, try rotating your cabinet while turned on, making the pump to be below the rest of the loop for a few moments to force the bubbles out of the pump.
I have an Intel i7 4790K, a famously difficult processor to cool. With a 280 AIO liquid radiator, I had thermal throttling at high loads and no overclocking. CPU cores went instantly to 100ºC upon load and rested at or above 60ºC at idle. Finally I gathered courage and delided my CPU, replacing the internal thermal paste with liquid metal. What a change! Now at load and overclocked, my core temps never goes above 60ºC. Make your research to see if deliding is an option for your CPU.