If your heels are already lifting, I would think that a flatter sole would make the problem worse. I would get a pair of shoes with a hard sole. I personally use my red wing work shoes. The shoes (not the boots) have a hard sole and not too much of a heel. The boots have a large heel. They also come in wide sizes, which is good for me because I can't squeeze my foot into a pair of chucks. The heels lifting are from lack of flexibility in the hams and or hips. I hold a heavy dumbell and bend over at the hips to stretch my hams before working out.