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I am wrestling with this decision right now, too. I think the part that helps lower the rolling resistance is the construction of the tread. If the tread remains closer to round, then the rolling resistance is lower. The sidewall matters if it contributes to the outside tread remaining closer to round -- if it flexes all around the tire, rather than just at the bottom point of contact, then I think it is important.
But, even the higher sidewall max is not an indicator of lower rolling resistance: the Michelin Energy Saver A/S is (apparently) the lowest rolling resistance, and it has a sidewall max of 44psi.
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