One of the simplest and quickest ways to add more food is by stocking an additional forage fish that spawns heavily and does not outgrow the size range that the average bass can eat. Threadfin shad have proved to be excellent supplemental forage when stocked in private fertile waters.
It may seem counter-intuitive, but using a high-pass filter to remove low-end from the bass can actually make the bass sound more powerful. By cutting out any unnecessary low-end, you can make more room for the bass frequencies you actually want to hear.