thanks for the help. I'm using a Tubus Cosmos rack in the rear and Tubus suspension rack in the front (so the front panniers are sitting high up compared to most set ups. I can put my Super Cs way forward before heel strike. That's why I'm wondering if I should move them back, I have room to adjust I just don't know what's best for handling. Is there some rule for rear load like 'behind the wheel axle' or should I put them as far back as I can? That is what I'm confused about the most if you get me. Let me know if that doesn't make sense.