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I ran 29mm on Mavic Aksium before, I have to inflate them a little more than I like to reduced that squirmy feel when cornering, it's only a little more comfortable than the 23mm it replaced despite bigger contact point.
I'd be better off with a 25/26mm tyres.
Having said that, a 25mm tyres on a wide rims (17mm internal) felt a lots closer to a 28mm at the same pressure without the squriming.
Yeah I've seen Sheldon's table. Did you find it noticeably flaky on corners?
(Academic question now since I am also a cautious type, I'm not doing it!)