I think I have your new build(s) as I can play from the archive, but the contrast is still too low for me. Note that displays are different, so it's likely that things are more indistinct for me than for you. I've just played through the archive, and all my mistakes came from off-by-one errors because the grid lines were indistinct and I misplaced the holes.
Hmm I think you made the grid lines thicker? I prefer it, but the thickness looks inconsistent (several divisions of the paper do not seem have thicker grid lines on my display)