With llc set to extreme profile i'm touching 1.38, which is +0.02 from the original setting, at 1.35
I would advise never to use extreme LLC. I don't care what other people may say or how good a board may be, the highest and extreme LLC settings will damage a CPU. According to your image, I would avoid Turbo and Extreme. The higher you go, the closer to 1.35 your voltage will stay during load. So stick with Low or Medium. As you can see, Turbo and Extreme overshoot your 1.35 vcore and it may briefly spike much higher than that (you won't see that on any monitor) when returning to idle. I'll post another video that deals with the dangers of Extreme LLC. In an ideal situation, you should be as close to 1.35 during load without going over.