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It's the stiffness of the rim that makes it more likely to rub; a shallow alloy rim flexes more at the bottom and transmits less deflection to the top of the wheel by the brakes.
http://www.bikeradar.com/road/gear/article/bicycle-brake-rub-wheels-vs-frame-49344/
dubtap
OK so I raise my hands, I got a nasty rash of compulsive upgrade disease.
I had built for me a 24h front 35mm deep crabon on a dyno hub. Pillar aero spokes, alu nipples. 28h rear on high flange Phil. Tubeless, 28c, yada yada.
When I get out of the saddle to climb the front wheel has tons of lateral flex, so I'm rubbing on the brake pads. Rear wheel has no brake so it may be flexing too.
Wheels (and crabon fork) otherwise have improved the ride's weight and zippiness immeasurably.
Should I just put it down to experience and go back to 32 spokeland where I belong, as an overweight middle aged lazybones?