it could also be as simple as playing around with cleat position. you dont want to screw around with a whole bunch of stuff and then not know what adjustment it was that actually made it better/worse though. start with a couple small adjustments and see if that helps. ride it around the neigborhood to see if you can tell any difference. then when you go on a large ride, be sure to take a tool with you so you can make adjustments. If these minor things dont work, I would really think about investing into a professional fitting.