I miss when eraser removed sleep... Anyway, maybe it's just me, but when I'm soloing with Soulsoother and it uses mana converter, it will usually cast cure V to heal itself... and then that won't be enough to actually heal it to 100% HP, but this is usually in dynamis where it's perma-dark weather. It could be because I don't use either of the auto-repair kits on Soulsoother, and it won't trigger cure VI because of the lower HP.

I'm not really positive casting cure IV would be that useful for Soulsoother unless you ride 3 light maneuvers all the time. And even then, you'd have to swap in AF pants every time it cures you to hit the cure potency cap. Just my opinion, but I'd rather my puppet over cure than under cure to save a few MP.