does the voltage offset impact performanceIt is a bit higher than normal considering the cooler you have.
35-40 is my average with a Wraith Prism stock cooler.
I set a voltage offset of - .100 in my BIOS as my gaming temps were around 75-80 and idle used to be around 45-50.
You can try this to see if it helps.
Also make sure you are using Windows Balanced Power Plan and that your cooler is properly mounted to your CPU.
Decent quality paste applied in the proper way is vital to cooling.