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The s2 is famous for being a bone-shaker - I tried Alu bars initially and it was unridable!
There seems to be a black art of flex for comfort and too much flex when riding aggressively. My most recent set up was 25 tires, 2.5mm tape and carbon bars which seemed to absorb most things even when riding on the hoods in aero position. i did notice a but of flex when climbing however
I'm not gonna be crit racing anytime soon so the sprinting point isn't really that relevant to me
I've got the SL70s on my S2. I like them. Haven't noticed any flex, but maybe that's a lack of power on my part.