I want to see an Adjustment to ERA+ and -FIP, -ERA, -xFIP
I want them to adjust for opponent valuations
And by that I mean....
What are the average values of the teams offenses that you face.
For example, last year, David Price faced the highest combined OPS offenses (something like .760). I don't know how, but I would like to see this adjustment come into place for that.
There is a degree of competition level, and if you are in a division with potent offenses, you are more inclined to have a harder time than a pitcher who faces weaker offenses in his division.