I've been trying to adjust the angle of the Brooks Swift I have installed on my current bike. I currently have the nose tilted slightly upward but I've noticed a little discomfort lately with this setup. I tilt the nose down and tighten the bolt but the nose goes back up to the way it was before. I've tried applying pressure on the nose of the saddle while tightening to no avail. What can I do to solve this problem? Here are pictures: