It is a common misconception that big bass stay deep all summer. Deep being a relative term. Here in the south the water gets so hot that without current anything deeper than say 12ft is void of enough oxygen to supportmuch life. Other lakes vary of course because of clarity, temp, nutrients, current, and a whole host of other reasons. Basically just because you fish deeper doesn't mean fish get bigger. This time of year a basses metabolism is in high gear, meaning it has to eat more to survive. Generally the move shallow, 10ft or less to do this on our deep southern lakes, bit the definition of shallow is also relative. I caught a 10lb 5oz hawg in less than 2ft of water last august. So don't think because its hot they won't go shallow.