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On pg 20 of the Bicycle Wheel, Jobst Brandt described the deflection in an alloy rim just above the tire contact point. This deflection effectively distributes the contact point load across a (relatively) long segment of the rim and tire casing.
Since modern deep dish carbon rims don't deflect as much as an older alloy box rim, a carbon rim would transfer tire contact point loads to a much smaller portion of the tire casing. Combine this with comments from others that some of Enve's clincher rims have a sharper "edge" than usual - and it's easy to understand why fragile "race day" tires may have problems with these rims.
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