I have this problem with the Jett as well. I seem to want to move back on the Jett saddle, after 15 miles I am moving around trying to get comfortable mostly back however. I don't have a good idea of where my sit bones should be with this saddle. I get chafing on the back of my leg/butt crease with this saddle R>L. Not as bad as with the SI Lady Gel Flow. Sit bones measure 130mm. SI Turbomatic is in the mail.