My comment may be irrelevant due to how FF14s Network Architecture might be built.... I have a co-worker at my job who tried to play WoW on satellite Internet. His latency was 600ms home and 900ms world. Basically, he couldn't play.
In my guild in WoW, one of our newer tanks was on satellite internet for 4 months (I didn't know she was on satellite internet till she told me way later). Her performance was unacceptable due to her latency and I didn't let her continue tanking harder content till she got better internet.
I hope this doesn't put some rain on your day but thought I'd chime in. Hope it goes way better for you though!