FFV Battle Windows

I found that changing the value at 0x11592 from C0 to BF seems to get rid of the gray line(s) at the bottom of the screen, but only when I replace 80 with 00 at the end of the Neo Exdeath BG table like you mentioned. But I don't know if changing C0 to BF would have any other effects on the Neo Exdeath BG, and if it does, it's not immediately obvious to me.

I didn't notice before, but changing the value at 0x1158F from 04 to 03 - 01 stops the line that overlaps the menu windows (and in the case of 01 and 02, the lines above that as well) from scrolling, in addition to the already noted effect of adding a line to the bottom of the screen, one for each step back. While changing it from 04 to 05 (and potentially higher since there's probably values up to FF that I didn't bother to check because it would take too long to) causes the line below the line where the bg overlaps the menu windows to scroll with the rest of the background in addition to getting rid of the lines at the bottom of the screen.

So maybe 0x1158F is what sets where the scroll effect ends, instead of setting where the bg itself ends and the menu begins?

A video demonstrating BF and 03 at their respective addresses, recorded with OBS in BSNES v115.
https://www.youtube.com/watch?v=EErvTIAPtb4

As a side note, to make Tree Exdeath go behind the menu window during the defeat transition, I changed 0x11596 from A0 to 9F.