Have you thought about a bolt isolator kit like this? Motorguide Mounting Isolator Kit - Trolling Motor Accessories
My Skeeter originally had them with trolling motor that it had when I bought the boat, and I haven’t had many issues with them since. I do replace them at every trolling motor change, and I also have access issues for a proper nut and bolt setup.
If I'm not at work or taking kids to their activities, you might find me on "The Rez" fishing. If not there, I could be in the garage working on my boat.