Stud H/L 3 to a low straight flush, with cards dead

[PokrLikeItsProse]

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Furthermore, the other low hand may be an idiot

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I've found that it's usually a mistake in stud games (and in most poker games) to make this sort of assumption as an excuse to be over-aggressive (but not a mistake to use it as an excuse to call down).

Also, I think you're overly optimistic about the other two players checking. I expect Seat 3 to lead on sixth street most of the time if he has a sane range that justifies his aggression.