I've only played with my Chocobo up to Rank 4 thus far, but already some issues are arising. I've only put SP into the healer skill, but I've heard of issues with the tank one as well.

Choco Regen is terrible as it is. It's about on par with your natural health regeneration. If it had something like a damage taken reduction buff attached it'd be different, but as it is, a 25 potency heal over 18 seconds is pretty negligible. Choco Cure is double the potency total, at once, without a cast time.

Also, I don't see the point of the accuracy boost trait in the healer line because as far as I can tell, he will only use Choco Cure in healer stance... And thus doesn't auto attack.