Hi, Daniel talking (I don't have access to my phone.)
Thanks for your suggestion. I thought about that, but I think strength in the Power really has to be independent of other characteristics. The closest thing to divine favor/innate luck in WoT is being ta'veren, but that really has nothing to do with the Power, and I would rather not collude the two.
The only thing that I can think of for keeping POW relevant for all characters is that it increases your chances of something special happening to you (becoming minor ta'veren, discovering you are able to channel, becoming a wolfbrother, etc.) while channeling ability is a seperate stat, but that also means altering the definition of POW.