As of right now there is no way to re-spec your chocobo. That doesn't mean that there never will be down the road though. My advice to you would be to put any and all remaining points into Attacker or Healer stance. Mine is about half way to Rank 8 currently and I've split my points into Healer and Attacker and it's working out nicely so far, I just won't be able to get Choco-Medica at Rank 10 which isn't a big deal to me.

He can currently solo his own level 50 mobs in a timely fashion, but more than one on him and he dies very quickly.