The seat back isn't the problem, the seat bottom is the issue--transmitting bumps up through my butt to my lower back, compressing my discs. Is the Koolback more padded in the seat bottom too?
I'll put some miles on it this next week, though I think I have to start by tying it on top of my car and hauling it up to the nearest multi-use path. That way I can get used to it without worrying about getting run over by cars passing by.
My late brother-in-law definitely had the fairing set up so that he would have been looking through it.
How high should the ends of the bars be? The left bar-end shifter easily interferes with my left knee.