I can't seem to tighten the quick releases tight enough to keep the seat from sliding back. I weigh about 213 or 220 in all my clothes. I have them so tight that the rods bow and the seat bracket bends in a bit. I cleaned the track and clamps so it can't be grease on the rail. I wonder if it only does it when I have some weight in my backpack hanging off the back of the bike. I guess if I strapped it to my rack and then checked the seat. But any idea's on keeping it in place? You can't use the speed adjusters on the limbo