I know nothing of pedals or MTBs, but I wonder if you went up 1/2 or a full size the toe numbness would stop? In my short-lived marathon career, that's what I ended up doing.
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Indy, my feet started sleeping as soon as I switched to my new Twenty6 pedals. They never slept on the smaller, less secure, bear traps. I think that the problem is that my feet are held so securely in one position on the new pedals that I lose some circulation. I solved the problem on today's ride by moving my feet just a few millimeters every few minutes.