From Joe Friels' training Bible:
A few years after that I tried mounting my cleats forward in the traditional position just to see what would happen. It lasted only a couple of weeks as I felt weak, especially when climbing. And my EF went back down – quite a bit down. Of course, I’m sure I would have eventually adapted back to that standard position if I had just hung in there long enough with the forefoot cleat. But I didn’t see any upside to that. I’ve been using midsoles ever since.
Shortly thereafter I had Don Lamson make custom cycling shoes for me with a midsole cleat. He’s been making my shoes like that since 2007. Until recently they also had to be 2-bolt midsoles as there still wasn’t room for a wider three-bolt cleat. Now that’s changed as he’s got a new last. He just made a beautiful pair for me that are wide enough in the arch area to accommodate a Look-type cleat.