Idle vcore isn't too bad, but the droop under load is awful.
Upping the vcore is the only option, but your load temps are quite high.
Whereas coretemp says its at 1.325V constant.
How old is this PSU?"Jeantech 600W silent artic thing"
How old is this PSU?
That vDroop is insane and tells me either your mobo is really weak *or* your PSU is struggling to supply the correct voltage.
They're on the high side for the speed and voltage, tho I've no experience with that heatsink. But I would expect even the stock heatsink to give lower temps that you're getting.
I may have ago a reseating that heatsink as I may have knocked it in my recent cleanup of the inside of the case.
I'll leave you in the capable hands of Cob!
Did you use the minimum amount of thermal paste