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HED Vanquish / Vanquish GP (they might have changed the names). Not crazy expensive, available as rims and made in U.S.A. I've been on Vanquish GPs this year and really like them, whole time on 28s. Optimized (that is, aero) for 28s but will easily take wider. If you want "optimized for 30" from an aero point of view, I'm not sure.
I'm on the GPs because they come in a 28-hole drilling, at the expense of some weight.
Caveat: disc only. You won't find rim brake hoops optimized for 28 or 30c though, I don't think.
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