Ok got a reply back on the vbSEO issue, they are saying its a problem with pure NGINX, vBSEO and most importantly the version of vBulletin we are running.
They say if I upgrade the version of vBulletin (we are now 4 updates behind) the problem SHOULD be fixed.
So now the question is do I upgrade the version of vb to the latest version. I am leaning twards yes because we are going to need to sooner or later. But I would like your opinon.
Like you said, you'll have to do it sooner or later, so...
Oh, and Good Luck.