Your 'curved' picture doesn't look very curved to me, nor do I see how it's a problem. Lots of saddles do in fact curve up slightly in the back by design. I have a Brooks pro on my fixed and a Concor on my roadbike. If the Brooks curves at all, it's nothing compared to the Concor, but I find both saddles comfortable. It's just a matter of personal preference. I've read that lots of racers back in the day liked the feel of the Concor and even more exaggeratedly curved saddles, esp. for time trials, as the design gave them, for lack of a better phrase, something to push against while grinding out big gears.