How are you capping the full 80% Fast Cast on NIN..?
I said for Utsusemi, which is the only thing you'll be casting aplenty. For the rest sure, you won't be capped, but you won't be spamming those spells either so 20% less casting time is not gonna be making a huge difference on something that takes 18 mins to be killed.
This is my current precast for Utsusemi:
Herculean head (7+6 FC)
Magoraga Beads (10% casting)
Loquacious + Enchanter+1 (4%)
Mochizuki+3 (14%)
Perf Leyline (8%)
Kishar + Weather+1 (10%)
Ambu Cape (10%)
Rawhide Legs (5%)
Taeon feet (5%)
That's a total of 79%
There's 2% more from Sapience Orb which I dunno why but it's not in my precast set. Wonder why since I do own a Sapience Orb >_>'
For non Utsusemi you lose 5% in the neck slot and 4% in the body slot, so you would be at 72% FC for non-utsusemi spells.
There's at least 2% more FC that you can get from a 6% FC aug on Herc legs and Feet though (I'm using stuff with 5% in those 2 slots)
To get back in topic before I give the wrong impression that I'm fighting against Kikoku: I do think Kikoku is an
excellent weapon in general, love it.
I just don't think Ninjutsu casting -20% is one of the most attractive parts of the weapon, that's all.
Edit:
Forgot about the job points hahaha
Guess you're capped for pretty much everything then with that -20% from Job Points alone, making Kikoku's third augment even more of a nichey and not particularly noteworthy stat.
I still stand by my point that Kikoku is fantastic, it's just that specific aug in particular that's nothing special.