Simply adjust the Expert Summoner passive. This is how it is right now:
Increases your Max Health by 10% if you have a pet active. Increases your Max Magicka and Stamina by 10% if you have no pets active.
This is how it should be:
Increases your Max Magicka and Stamina by 10% if you have a pet active. Increases your Max Health by 10% if you have no pets active.
Take some of the magicka from S+++ tier magsorc and give it to F tier petsorc, who does not have a heal on Ward and lacks slots for scribing skills. Magsorc goes to S+ tier, Petsorc goes to D tier. Everyone's happy.
You're welcome.