About twenty years ago at a Bass club meeting a guy told me he was out on SH in January and spotted a lot of fish bunched up tight real deep on his sonar. Figured they were bass and he dropped a Hopkins 75 Shorty 3/4 oz spoon straight down to them. He ended up catching about 150 pounds worth of blue cats he said.
Best eating cats I ever had came out of Beaverdam on Falls Lake. I bet the SH fish will be delicious. Olive oil is the way to fry them. Trust me!
If I was day fishing at Harris I would find a creek channel coming out of a cove where it intersected with a lake bed channel.
15-20 feet deep in the summer. Drop a hook baited with nightcrawlers and fill the live well up quick. Nights I would anchor in 20 feet of water and cast to 2 feet of water...and fill the boat up. I learned alot about catfishing on Harris.
Sometimes we would camp and catfish from shore. When we did that we would also run a trot line. I learned from that trot line that we often fished too deep. I would run a 100 foot line. Tie one end to a tree on shore and weight the other end down with a cinder block. the overwhelming majority of fish caught came from the first three hooks closest to shore. Once in a while you get one or two about mid way. Nothing on the 15 -20 foot end of the trot line.
The first time I ran that trot line out there changed the way I approached catfishing in a lake. My catch rate went up 15 fold. At night you want to be on the flats 1-4 feet of water. My largest always came from 2 foot or less of water at night.