Your power table for the 2 PSU rails are set to 375W each? I'm pretty sure they can only handle ~200W each. I know it will never actually draw 375, but still, why set them above what they can safely draw? IF you set them to 200, and you correctly left the PCI-E rail to 75 (which you have), that still gives you access to 475W, and since you have the TDP set to 450 and the power target at 425, that is still perfectly within limits. Also, have you noticed what the second table does? I have been unable to find any information on it, other than it controls some "Internal Rail" that no one seems to understand, lol.
I'm still learning about bios modding, but I am an engineer by trade, so I have a pretty good grasp of electrical theory and industrial applications, but I don't really do much electronic stuff, so I appreciate there are gaps in my knowledge.