Ranger63, I still use the 1st gen. SPD cleats. I have two pairs of shoes, a pair of Shimano mountain bike shoes for general riding (including high mileage charity rides) and a pair of carbon soled Carnacs. I don't suffer from hot foot, but cleat placement and/or carbon soled shoes have helped a friend who does. He had a problem with both feet and tinkered with the cleats one foot at a time 'till both were okay, his cleats aren't symetrical, BTW.
Brad