It’ll be a while to accumulate the emblems for the next step, but I have Mitusko at +7 right now. Her line is 711 / 763 /1486 ( I have so far gone Def > HP > Atk).
Node 8 is a 2% healing bonus or a 2% crit chance. In a vacuum I’d prefer the crit bonus. However, the fork for that follows up with attack at node 9, whereas the fork for healing has defense at node 9. Generally speaking, I’d prefer defense to attack and that is the way I’ve been embleming Mitsuko so far.
I’m not sure which path to favor. Please help! You have until I get ~100 more sorcerer emblems to decide.