I have Odyssey Twisted pedals and Retrogression straps on my bike. I've recently noticed that, after riding for a mile or two, my foot has slid forward in the pedal a bit. Slightly past the ball of my foot and more towards the arch. Is this a result of my setup (seat too far forward, etc...), or should I just get grippier shoes? My past bikes have always had toe clips, so have never experienced this issue before.