Hey Bobben2!
Thank you for your detailed explanation.
What you wrote will definitely work!
I do it a little bit different.
I modify the rom in a hex editor and change the voltage entirely.
In other words, i do not change the dpm tables, i just lower the entire voltage by -100mV (for example) so that the controller itself will automatically give the voltage that is needed.
In this case, a specific clock won't give you issues as the controller will adjust voltage for what is needed.
What you did, as said before, will definitely work, but is in a way a little more intensive, because the dpm values won't be set automatic, the controller will use what is set.
In some cases this could go wrong, for example, the card will need a specific amount of voltage, but the dpm value associated to that clock won't be able to give enough.

Regarding power, in this case it will use less power in comparison from what i do

I'm glad you worked things out!
As said before, i'm still working on it, my target is to achieve the same results as the Stilt did with his released hawaii roms from a few years ago.
Will keep you posted in this thread as well!
Greetings!