Question for you: In your math for weapons with Potency runes, did you have Power Attack add just a single die (and two dice at level 10), or did you double the number of weapon dice?
For example, if you had a level 5 fighter with a +1 Greataxe using Power Attack, is the damage 3d12+str or 4d12+str?
A straight reading of Power Attack suggests it's 3d12, but by some logic, and things like the COUNTING WEAPON DAMAGE DICE sidebar on page 179 suggest it's 4d12.
I think the only big variable missing from the calculation, on second thought, is how all this interacts with the new weapon properties like fatal, deadly, forceful, charge, and the like.
Sidebar of page 179 says that power attack's extra dice don't help things like forceful, fyi. I know that's not really what you were talking about but I wanted to point that out.