your frame clears 32C. you'll be faster if you're comfortable --> wider tyres. Wide tyres on wide rims are faster too, or at least not any slower --> Serenade has TRW80S, 34mm wide (23 internal), hooked (obviously), 80 deep. Put a 28 or 30C on that, and you'll have a rim wider than your tyre (aero maxxing) while comfort maxxing.
That's double maxxing. That's what she said.
I'm sure others have similar moulds. Peter, probably.
By buying a 34mm wide rim, you're also insurance maxxing, in that your resale value will be higher for longer (~ all frames that clear 32C should clear a 34mm rim (if not they're lying on frame clearance, essentially), and a 34mm rim lets you run 28, 30 or 32, with a great tyre+rim profile. Narrower rims are on the decline (i'd never buy one, full stop). A wider rim might also be more stable in cross winds.