hey guys, i just got my new shoes and cleats and am having some serious trouble clipping into my pedals. the pedals are the shimano m454 dh, and the shoes are the shimano m181. both are spd systems. ive loosened the systems and pushed as hard as i can...nothing. ive had a closer look and it looks as iff some of the studs/grip on the bottom of the shoe is hitting the cage of the pedal before the clip bit. any advice?