Thanks for all your replies. FWIW, I have about 8 pairs of bike shoes of various lengths and widths, and found that the spd clip on the shoes - which are attached under a cutout of the insole, still apply pressure to my sole. The SIDI roadbike shoe and pedal made the pain go away because of the stiffer shoe sole and the larger surface. But I'll try out a platform, probably the Azonics, and see how that works. I looked at the Riv pedals and decided that the Azonics have a larger surface to spread the pressure out more.