I'm all for some upgrades to the chocobo system. They definitely need some love in their abilities for example. In my personal experience Tank Stance is almost near useless since they took away the player's ability to dump off excess hate. When I was leveling healer I set my chocobo to Tank Stance, fully maxed out in EXP so every skill/upgrade was unlocked, and it majority of the time couldn't hold hate. The only means to do so was to completely stop doing anything beyond tossing out Regen or a very weak Cure until it built up considerable enmity, and even then the moment I begin to DPS again it would slowly build back up and attack me. One of the few times I've seen it work was on FATE bosses that took a long time to kill but even then I had to cut back on the damage output. Using food that buffs their enmity gain helps, but not to the extent I'd hope.