Put slinkies on the feeder legs cant climb them.
Also put out some Duke's dog proof traps. Unless there dead Thell keep coming back.
I did slinkies on my year round feeders. At first it was working great and did for a while. Over the summer the coons destroyed the slinkings. Straightened out, bent up, and one even broken or bitten in two. Note I was seeing coons on the game cameras numbering sometimes up to 10 or more. I went back to using the cheapest axle/bearing grease I could find to put on the legs which I found holds up better than the Vaseline did in hot weather. It will last around 6 months before needing more added. I have also started trapping as many of the critters as I can. I believe the wire pictured at the start of the thread will only make it much easier for the coons to climb it.
Also your T posts are dangerous. If you fall off your ladder you could get impaled. Imagine that happening while your alone. Besides as long as those T posts are, they make it that much easier for your coons to climb. You could use shorter rebar or cut T post pieces and drive them in parallel to your feeder legs. Then wire them to the legs at the base. You only need a foot or two above ground. I like to use two or three radiator hose clamps and a cordless drill/driver to make it a fast, easy, and solid attachment.