Quote Originally Posted by Dustytome View Post
The xp scales up yes, but the % of the total you get past lvl 10 goes down. Just tested on a few chocobos in the stables (stable is sparklin clean):
lvl 7: 1%
lvl 12: .79%
lvl 17: .55%

Edit: Skimming posts and not thinking clearly... the issue is likely the stables needing to be cleaned as Zetsumei pointed out. It'll give the maximum experience reward if it's sparkly clean.
Just out of curiosity where did you get that info from? i started testing it on my alternate and don't really see it. Anything from SE?