Damn……….I guess I have to answer my own questions in this forum.
Whelp, here is my answer:
Turned out to be a defective gasket. Supplier gave me a new one and fixed the problem instantly. Toilet came down flush and is now steady.
When I called Toto, they explained that even though it was rare, it has happened from time to time, as with anything, there is always room for error in workmanship.