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158 feet on the shallow side. 165 in the washout. Perfect for an AN/DP class.Horizontal penetration wouldn't really impact on the gas choice. The wreck sits in 140 feet of water, so maybe they just suggest a slightly leaner mix so that you have more options below the deck (Rudder and propellers? Not sure).
I have dived it a number of times, on air, 30 and 32. Does the operator give you that choice, or is it just 30 or air?
If you are definitely not going below the deck, choosing a richer mix would give you longer NDLs, and there is a lot of relief, so plenty to see above 100 feet!