Okay, so I tried mameUIfix last night - and it has pretty much cured all of the problems. I have set 'throttle' off, sync-to-monitor-refresh on, refresh-speed on (no triple buffering and frame-skipping is unchecked). Space Duel now runs mirror smooth and the big space ship in Asteroids no longer hesitates every second or so as it travels. Sound is fine. Note that the Irem stuff which moves at 55fps is now slightly faster. This doesn't bother me as Image Fight and Legend of Hero Tonma are also mirror-smooth.
Thanks to Grog for useful links to the correct settings and pointing me at mameUIfix.
God, I miss those dark, musty arcades ....
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