I'm sure that many of us have noticed how the clearance problems of spinning your cranks in circles gets drastically worse as foot size increases. If you wear size 12 shoes or larger, you've probably experienced both of these clearance problems. It isn't getting any better with newer design. Longer crank arms, wider rear ends on frames, and a leaner Q-factor in bottom bracket design have made modern frames more problematic than the older ones. Sometimes curved chainstays compound the problem, sweeping out right where your heel is going to strike it. On tighter frames, toe-overlap can be an issue even for those with normally-sized tootsies. That's an issue one can learn to live with through cautious technique. Heel-strike at the chainstay is more annoying. How have others dealt with this?
1. Stick with older frames designed for 126 mm O.L.D. hubs?
2. Prioritize long chainstay length/longer wheelbase when buying a frame?
3. Use a triple-chainring bottom bracket spindle (even if you're running a double)?
4. Cleat adjustment: as far back as possible...pigeon-toe the angle?
5. Stick with 170mm crank arms?
6. Pedaling technique?