I'll let you know right now to not go to Gridania when you're starting to take rank 10 battle/field leves. Because of the corridors of the Black Shroud, Emerald Moss is very dangerous to navigate around due to your leves having you run straight through areas of aggroing mobs.

La Noscea and Thanalan are both fine otherwise, Thanalan might have a peiste hiding out somewhere in the leve areas so just be careful there.