If you came to me at my clinic and said the same things you've said here these are the possible causes/hypotheses I would have:
1) You could maybe relieve the pressure by moving your cleat back as far as possible
2) Your calves might be tight, forcing you to flex more through your fore foot instead of your ankle during your pedal stroke
3) Your pedal stroke may be uneven and doing some one legged drills would help to figure that out
4) It may not even be just your feet, or even your feet at all, it could have a lot to do with your lower back and hips
Does any of this strike a cord with you? If you like the Candies, I would explore some of these other options first before switching and I would try the specialized BG inserts as well.
If you are tiny, your cranks will have your feet positioned outward relative to your hips more that the average person and that makes you collapse inward at the foot. The Specialized BG inserts have a forefoot wedge that helps with this. You could also more your cleat as far to the outside of your shoe as possible (moving your feet inward). I'm not that familiar with the cleats so I'm not sure if that is possible. If it isn't, I think there may be a model of the Candy pedal that has a shorter pedal axel, but it's the really expensive racer version.
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2007 Look Dura Ace
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