There can be something connected to these skills (looks like mysticism is involved in this).
To devs: Create pet with JUST mysticism and focus and watch his spell dmg. Then - add magery and EI as skills, not as Pets Lore & Knowledge
Pet will not use magery spells, but if it is connected to Mysticism, some spells can have higher dmg and then it will be OP. 0 and 120 skill will make big difference, if there is bug somewhere