I didn't go higher, I didn't want to risk it. I just tried 3466Mhz like GoldenLag suggested and it seems stable atm (currently running an AIDA 64 stability test) normally it would crash some seconds in but it has been 5 mins and it's still stable.
You are correct, just tried 3466Mhz and it's stable for the moment! Thank you for suggesting that.