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I see where its coming from now. I will note that pg34 explains why they recommend 4V as the lower limit and confirms the phase inversion at high amplitudes.

We must be looking at a different datasheet or different spec. I see the absolute CMV spec as (V-)-.5V to (V+)+.5V but that's referring to a threshold of damage. Under recommended settings on pg12, it quotes (V-)+2V but that's for NS and PS, which to my understanding is more military spec...

It has recently come to my attention that the Common Mode Input voltage range of many opamp (especially TL07xs) substantially limits the voltage swing. https://www.ti.com/lit/ds/symlink/tl072.pdf?ts=1721265968534&ref_url=https%253A%252F%252Fwww.mouser.com%252F http://fpgacpu.ca/bass/bdi21.html...