I used to have the kind of heel pain that you describe when standing barefoot, and used Superfeet insoles in every pair of shoes I used. Ever since I started massaging the bottoms of my feet by "standing" (without full weight, obviously) on a 1" bounce ball and rolling it around under the arches and the front of the heel, that has almost totally gone away. The first time I did it, it was incredibly painful, but I noticed improvement almost immediately. Give it a try. I also find that massaging the soleus and gastrocniemus muscles in the calf by using the knee of the other leg helps.