possible solution
I dunno if it would be alright or if ok to do I would look into it though but what if you got sand bags and filled them up with sand from your beach or right near the dock and then tied them with rope or some type of line to your water line and the weight will pull it back to the bottom and depending on how far you want it off the lake floor, you can adjust the rope you used to tie them to each other. back in the day, way back my wife's family used to do this on sleeper island.
Cheap very strong way of solving the problems
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