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I checked the sync signal via scope and didn’t notice anything extraordinary besides F3 using odd-odd field signaling like many other Taito boards. As the digitizer chip in OSSC has trouble accepting such signaling via analog sync inputs, I hooked up RGB+csync from Supergun to AV3 (csync -> VGA hsync pin). Then I switched to AV3 RGBS mode and set H-PLL pre and post coast to 4, after which OSSC happily locked to the signal.
I wonder if there are some differences between boards (or even games) as I didn’t manage to get my Framemeister to work well with F3. I had to disable framelock to get it to sync at all, but even then vertical jitter was bad enough to make any games unplayable. I recall FM getting along with odd-odd field signals with some caveats.