The bass should be in summer mode by then. Walk the dog plugs, flukes, and something to drag on the bottom would be my first 3 choices. Buzz bait and some jitter bugs for after dark, walker could work too. Fish the faster moving baits while you are moving along. Fishing bottom bouncers from a moving boat is hard unless the current is slow,our slack. Slow the boat, stop it, eddy out ang cast back up, our get out and wade if you need too. Might try dead drifting a wacky rigged Z-man Zinker or cut one in half and fish a Ned rig if all else fails. Hope you have a great trip