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I'm surprised at the figure quoted of 'more than 10mm flex' in a DF. Unfortunately (or fortunately!) I sold my Orbea Onix DF so I can't test it but I will be asking some locals here to stand on a pedal and see how much their frame twists.
I find that I can climb 'nearly' (mirroring Brads experience) as fast as the best DF climbers in our age group* on both the Raptor and my P-38. It's taken me several years to develop the technique and muscles and I think I'm working harder than the DFs, but I can't prove that. It requires good circular power input and a careful watch on the HRM and the road gradient. I know that as soon as the road levels to below 8% gradient as it nears the top of the hill, it's time to change up and accelerate to catch and sometimes pass the DFs. Yes...Oddly, I find changing up easier to do than trying to spin - I have strength but lack oxygen.
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