Just joined. I'm in search of the perfect flip flop/casual sandal. The problem is when I get one that is soft…

Just joined. I'm in search of the perfect flip flop/casual sandal. The problem is when I get one that is soft enough not to hurt my feet, my back hurts. If they are supportive enough to help my back, my feet hurt on the bottom. I'm flat footed and going barefoot is no problem for me. In fact barefoot feels best. These are the following shoes I have tried. I would welcome suggestions. Back great, feet hurt Archies Chaco