Tips are not adjustable, if out of line as you describe then system is out of line and a fix is easy. Ignore the rear rubbers, they are just mounts. Get under car, loosen the 3 nuts/bolts that hold the front and rear sections together. Give the clamp a good tap with a hammer to get it slackened. go to back and rotate rear half of system to line it up, getting the wife to hold it in position as you nip it up again, job done. You may find the clamp has come loose anyway.