What about the level of the AA of pet used for AA

[Ravager]

My level 7 nekro does 190 damage on AA, my level 7 Munch with nekro AA does only 84 damage

Part of the calculation for nekro's AA / Shield was calculated from the pets damage. Nekro and Stampy have damage (seen from the pet stable) higher than mostly all other arcane pets. Perhaps this is why.