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Weird. My experience is exactly the opposite. I hardly have a climber's physique - more puncheur/fat bastard depending on how polite you want to be - but I've ridden those wheels for 15 miles with an absolutely flat rear tyre (forgot my pump) and they shrugged it off no problem. Never needed truing, still running dead true after 4000 miles, mostly over roads which are so bad that one chap's saddle came off last time we raced a TT on them.
I also had them on a factory Powertap too and the combo was a disaster which is why Powertap dumped them ASAP. Noodly flexy rubbish unless you are climber build. For a 32 spoke rim they are shocking.