Numb feet
Hello
When I was riding my mountain bike on the road long distances, I got numb feet also. But in my case I do not believe it was the shoes. I believe it was the seat pinching a nerve in my groin area. I would have numb feet long after I was off the bike, during the summer riding months. After changing to a regular road bike with a better seat for distance, it went away. This may be something to consider also. I know recumbent seats do not dig in like road bike seats, but there could still be a lot of pressure on a nerve while sitting.
Harold