Lag here also on Balmung.
Vahn Athsea and Aurora Athsea. PS3 and PC.
No noticeable ping spikes during lag sessions.
I was running Stone Vigil about 8:00 CSTpm
Hit skills multiple times and they half way activated then canceled themselves(on drg). I had to hit the skills several times to get them to activate.

Never had any lag issues before.