I can't comment because I think your description is suspect.
quote
The vent pipe ties into the drain pipe right at floor level under the sink,
and then goes directly through the floor and makes a 90 degree turn
immediately to begin the transition to the rear of the house.
end quote.
I think the DRAIN takes a 90 and goes to the back of the house not the vent.
quote
Has anyone here piped in a sink in a similar fashion putting the vent line
below the S trap?
end quote
If it really is a "s" drain that is no longer allowed. Is it actually a "p"?
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