I did not even notice the foot placement. I agree with Troul regarding getting the pedals centered on the backside of the ball of the foot. That alone will change the positioning of the lower half of the body. I see a whole of people riding with the pedals at the instep or the heel. I am not being critical, I just do not get it. Especially the heel position, which seems to me like it causes the foot to be significantly angled to prevent toe lap. Ball of the foot, I believe, is much more efficient, and puts less strain on the rest of the leg, which maybe reduces stress on the lower back.