.. yeah I totally knew that materia had no bonuses in synced PvP content, don't know why I was thinking that long enough to mention it in a post.

Ok - so pretty much any piece that has Vitality on it will be synced down to whatever the VIT cap is at level 80? So if I have every piece of gear with some VIT on it at or above level 80, then there's nothing I can do to get more HP?