So, I have no idea why or how, but my lag has gone away. After a week of it constantly, it has finally gone away. Both times I logged in today, I was lag free. The only thing I can think that I've done differently from some of you here is that I posted in the Technical Support section of the Japanese forums, in Japanese. I live in Japan, and my ISP is through OCN / NTT Flets Hikari, but I had contacted them and was told the problem was on Square-Enix's end, so I'm confused as to how this got worked out. I'm not sure what this means, but here it is. Make of it what you will. If the lag comes back or I get 90000 errors again, I'll be sure to post about it.