I never had hot foot until I went clipless a few weeks back. I got the Specialized Expert shoes with the CF soles and you would think they would be stiff enough it would spread the force out well helping not to be a problem. I have foot beds coming this week to see if they help.
That being said, my 40 miler yesterday I didn't have a hot spot problem. I tried to keep my cadence up and not mash and I think it helped. The ride prior, the balls of my feet were burning pretty good after 30.
I'm still a rookie in the great scheme of things and have only been riding for two and a half years or so. I still have a lot to learn. I never had a hot spot problem before going clipless even on 50 and 60 mile rides. YMMV