If you are suffering back and heel pain, I'd suggest you might want to go and have a session with a bowling coach. It may very well be your shoes causing issues, but back pain is often the symptom of an unbalanced bowling action or stress being induced by the way you twist in delivery.
If you try and bowl as fast as you can all the time, you often will not be bowling efficiently and this may lead to your problems.
On the feet side, most bowling shoes now include some form of heel cushioning, which may help with your issues, but your heel issues may also be a symptom of bowling action problems.