Sorry to be an ass, but...

http://forum.square-enix.com/ffxiv/t...ndeavor-broken

http://forum.square-enix.com/ffxiv/t...vor#post666000

http://forum.square-enix.com/ffxiv/t...d-Endeavor-bug

http://forum.square-enix.com/ffxiv/t...-Bold-Endeavor

And yes, you're right about the success/great success stuff.