Sell the boat and get a kayak.
I did well paddling through the shallows and around ledges while trolling a tube-n-worm.
Going slow and having the tube low in the water column definitely worked.
I didn't go much deeper than 15' and just used braid with a 5 - 6' leader of 50# flouro.
The more I could make the tube spin, the better my results would be. To prevent line twist, I used a Luhr Jensen rudder between the braid and leader and used top quality swivels.
I had a couple colors and sizes, but a weighted red tube was the top producer.