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I'd look at the saddle first thing (as well as position), it's best to rule out the cause first before resorting to an aerobars.
A different saddle shape/position can make a big difference, I've seen customer whose back are arched to the point that they bear a resemblance to a beetle pushing a dung, putting him in a saddle with a cut-out actually help him to relaxed more and able to have a straighter back because his undercarriage isn't squashed up, this is just one example.
Sort saddle position out first, then concentrate on bar set-up.
Yup, rider's blog post about his equipment is here: http://allegaertk.wordpress.com/2014/07/29/bike-set-up-transcontinentalrace-2014/
He's sponsored by Jaegher and Campagnolo.