Honestly......

Unless everyone is having the issues it won't be seen as a "huge" problem - I said it before in another topic, the very fact players can play and play without issues while there's those have issues, kind of throws this whole "push" for an answer out of whack.

I'm not a huge programmer but I know a game can't work for some and refuse to work properly for others without local variables, i.e something on user end rather than immediately blaming net code. If the net code is the issue, clearly it's having issues with some people's ISP routing otherwise you would have no one being able to play this game smoothly, it's just as simple as that. The very fact you state you get extreme lag in Ifrit HM yet in the hundreds I've done (literally..) haven't really seen anyone complain about lag, especially not graphically - People play this maxed out all the time.