I did an important experiment with Fish Mithkabobs and Boiled Crab so I might as well post the results here. Forgive me if this has already been discovered. I originally posted this on Gamefaqs.
First the numbers:
lvl 43Paladin/15Thief
97=base defense
220=total defense (base + equipment)
122=base defense with fish for a gain of 24 or 24.74%
276=total defense with fish for a gain of 55 or 25.00%
124=base defense with crab for a gain of 26 or 26.80%
271=total defense with crab for a gain of 50 or 22.72%
*Notes: I've triple checked these numbers and they are
100% untainted results. I've also subtracted 1
defense point from all 4 of the food totals to
cancel out the constant 1 defense that's added
from the 2 vitality. I figured the gain # and %
with the 1 point subtracted already to make
the results easier to study.
I'm doing some testing with some other jobs but so far it looks like the % gain is based mostly or maybe even purely on the actual defense stat and not on the job levels.
Regardless, these results show that fish actually gives a slightly higher % gain the more starting defense I have. Adversely, the crab takes a pretty dramatic plunge the higher my starting defense is.
I still need to do more research but here's a crazy theory: What if Square-Enix halved the mithkabob crafting results because it's the better food for higher level jobs?
I'm getting way ahead of myself though. Onward with the testing.
Oh, and once again please don't flame me if I am wrong or just stating something already well known. I've been away from the game since the update and I don't spend all day cruising message boards.