I haven't played Doom in a while, but I thought if we hit with both an Energy and a Mental Power that we would get +3000 Physical Damage. And also with the other 2.
Or did they change it that it is 1500 max even with 3 different kinds of powers, like with Doom & Rogue.
Anyway, I only see +1500 increase now. But maybe I am confusing it that we get +3 Attributes