welcome to the club.
i know guys here that fish semi-pro and they aren't catching any fish to amount to anything either.
having the expensive electronics certainly is an advantage. however you can catch fish this time of year without them.
we were getting skunked in deep water (using lowrance HDS10s). so out of frustration we moved back to shallow water around grass and started catching fish.
at least for me i have found that a slow, finesse type technique works best when the water temps are the highest. i've had great luck with the drop shot rig. just by simply dropping a green or red finesse worm around structure.
hang in there, fall bite is already cranking up here in my neck of the woods.