Hi Mike,
Having previously closely studied* the way steam comes off hot pasta (as I recall, it kinda clings to it briefly, then ascends IYKWIM), I knew that part was 'simulated', that said, I can appreciate the problems, in fact I'd say it would be very difficult, if not impossible to capture the real thing as it only lasts a few seconds.
* and it's better to study it than ram it in your mouth and burn yourself
I'd think the cool ambient makes the steam more long-lived and visible, but also (of course) cools the food quicker, so is a double edged sword.
Excellent lighting and use of reflectors for same - and the description of, very helpful - thanks.
Cheers, Dave