Sorry you guys struck out. I am still catching fish on those structures after locating fish hugging the bottom in 12 to 18 fow. I only use Mepps #4 Aglia plain silver spinners, so don't know if slabs or soft plastics would work. The fish are quite finicky and move around frequently. I can catch only 2 to 5 after I locate them. Then they move around on the structure, and I have to re-find them. When I say finicky, I mean I have to try various actions to get them to bite. The most consistent method right now is from the bottom abruptly start the spinner up at a 30 to 45 degree angle then continue moving it as slowly as you can and still make it spin. I reel it about 3 turns on my 7.1 to 1 reel and, if no bite, release the reel and let it free fall back to the bottom. When they strike, it is usually within the 3 turns of the reel, but I catch a few when the spinner is falling back to the bottom. Sometimes I use the rod to drag the spinner rather than reeling. Sometimes it works better to pull to the side with the rod as I reel, and at other times to point rod right toward the line and reel.
I'm catching 8 to 10 fish per hour this way - mostly magnum whites and legal and short hybrids. Best day last week was 42 in half a day. Yesterday afternoon it was 16 in 2 hours. It is absolutely imperative to locate the fish down on the bottom first to catch fish this way. I'll try to get a screen shot of the bottom pattern I am looking for and post it here. Water temp now is 49 to 50 degrees.