Last night I captured this tape a 4th time, and tonight I may try to get a couple more. Four captures stacked together improves the image quality somewhat, and my goal is to stack at least 10. Trouble is, apparently SECAM was just not a great color format. Isolating the red channel in particular highlights this.
Stacking multiple captures may only clean it up so much. It’ll be somewhat less noisy, but there will still be a lot of bleed.
I’ve also read that multi-format VCRs like the one I’m using are just not that great in general, but at this point I’ve sunk enough money into this project that I’m not going to look for a SECAM-only VCR. Ten or so captures, stacked, then when I get back to Florida I can look into getting a proper raw RF signal from my other VCR, since that one is much more expendable…