Still flashes. I actually can't tell a difference comparing the two. Not really sure what else I can do to help, but I notice the 'shadows' act a bit funky on these flashing screens as well, sometimes lagging behind the model, or in this case partially appearing over the model's arm?
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Raine doesn't cause many issues by herself here (I might have gotten one white flash, which didn't even take the whole window?), while Aveline gives frequent full window gray and black flashes, black being the more common of the two.
If the only fixes you can find might hurt the quality for others, I'd suggest seeing if you can throw something in the settings to let players choose. Not sure how feasible that is, but I have seen a few renpy games with newly added settings before.