Here is some calculations for the possible formula for the Normal and Heroic version based on the last post I made:
Normal: I started by making a character with 5 attack power, to find the base values. (I picked one with minimum attack power, since that gives the best result, since we get the base physical damage on that).
The Normal tooltip reads: 11332, with 5 attack power, this as close as I can get to that original formula.
Now I went back on my character with 21143 attack power.
The tooltip reads: 25600, with 21143 attack power.
Now we can do: (25600-11332=14268), then (14268/21143=0.6749), this means the AP scaling on the normal version is 67.49%, this will now be tested.
With 21143 attack power: (21143*0.6749=14272), then (14272+11332=25601), this is 25601, while the tooltip reads 25600, so I'd say this is as close as it gets. You guys could test this out on a character with 0 strength, if you want a perfect formula, I can't do that so I have to work with the 5 attack power, and that will offset my formula by 1 - 2 damage points, but this is minor.
With 27231 attack power: The tooltip reads 29709, now we just do what we did earlier. (27231*0.6749=18378) then (18378+11332=29710), tooltip says 29709, formula says 29710.
I'd say its fairly accurate to say the normal formula is: 11332 + 67.49% of the players AP(attack power).
Heroic: The Heroic tooltip reads: 12791, with 5 attack power.
Now I went back on my character with 21143 attack power.
Since I have already explained it in the Normal version how I got this result, I will just go through it.
Heroic tooltip: 28898.
(28898-12791=16107)
(16107/21143 = 0.7618)
Now we test the AP scaling of 76.18%
21143 AP: (21143*0.7618=16107) then (16107+12791=28898)
This is spot on with the tooltip so far.
27231 AP: The tooltip now reads: 33538.
(27231*0.7618=20745) (20745+12791=33536)
Tooltip is 33538 and formula is 33536, again this is just 1 - 2 physical damage off, which is minor.
Result:
We are now left with 2 fairly accurate formulas.
Normal: 11332 + 67.49% of the players AP(attack power)
Heroic: 12791 + 76.18% of the players AP(attack power)