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Yep that's pretty much what we found too, except in SCCA T4 we expect to have weight added and a restrictor, so it would push it into the 1-3/4" category.
Having said that, for SPB 1-1/2" is more than plenty for the weight of the car, based on 15+ years of hundreds of Spec Miatas racing at 2350-2450# with 1-1/2" .095 resulting in zero tubing failures, and that's with only 8 allowed attachment points.
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Todd Lamb
Atlanta Speedwerks
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