Then 1400 calories and 100g of protein is way too little. If you haven't already, you'll lose a substantial amount of muscle with that diet.
If you're going to spend $120 on shoes, you can get some good weighlifting shoes with a solid raised heel.
Get a different belt, too. By definition, a belt that is wider in back is not properly made. It should be the same width all around, like this: http://www.amazon.com/Leather-Power-...551085&sr=8-10, or a Best Belt, as discussed here: http://startingstrength.com/resource...t=27295&page=1