So I figured out what was happening with this media texture. When I original brought in the 23.98 fps exr frames and added them to the sequencer, the sequencer was set to 30fps. I’d then changed the fps to 23.98 of the sequencer and moved the media texture to frame 0001. However internally sequencer was still thinking that the start frame should have been 0001 at 30fps, so it was adding a slight inbetween to the footage thinking it was starting at a subframe.
To fix this I set the sequencer timeline back to 30fps and dragged the media to 0001 and then switched sequencer back to 23.98 which fixed it. On the time line the footage visually starts at a subframe, which looks counterintuitive but actually works. This allowed me to set me AA back to 5x5 and looks lovely.
Moving forward, lessen learned is for when I create new projects to be sure that I change the fps of sequencer to 23.98 BEFORE I add the media tracks and then it behaves as expected.
