Error 90000, lag, timeouts at Ormuco IP

Greetings forum!

I've been having this problem more or less since I started playing FFXIV, sometimes being a bit better, sometimes being worse, generally making my experience with the game horrible.

I've contacted my ISP, I've contacted the FFXIV/SE support, it wasn't a problem on my ISP's end, and has never been from what I've been able to tell from tracert or pathping.
A few minutes ago, I got 100/100 packet loss from an Ormuco IP, and the ping was horrible at the end there, where Square Enix actually has some influence.

When contacting the support, I was given the answer "Follow the steps in this FAQ." and they linked it. I followed every step, although I had already done that. I contacted them again, because problem wasn't solved. They said "Make sure you've followed the steps in the FAQ.", I did it again, contacted them, and the reply was pretty similar.
There seems to be no interest in helping, or even saying what the problem actually is.

So, to this day, I've been getting error 90000, lag, especially when in dungeons and such, and frequent timeouts, and when checking everything, everything points at Ormuco, which is what Square Enix are using.

Now I'm asking in the forums, is there anything at all that I can do about it?