Quick update - today I installed three strands of hot wire a couple of feet off the existing corral panels, just to keep him off them. He wasn't able to move them any longer with them staked in place but was tearing his mane and neck to shreds sticking his head through and straining to reach as far in as possible. And also still getting way too much grass that way. I got a nice solar charger from Premier and used twine and step-ins for most of it with T posts at the corners. Once the grass dies in the fall I'll mow down the fenced-off part and extend the fencing to make a track all the way around the outside of his paddock. It will be about 6' wide on the long sides with a loafing area near his shed and a wider area in front as well (little grass there since that spot floods when it rains, that's his napping/rolling area). I forgot my fence tester at home but he kindly tested it for me - there was an audible crack and he seemed highly unfriendly towards the fence after that (up until then he was "helping" me very thoroughly, removing tools from my pockets, twanging the twine, stealing insulators from the bag, etc.). So, fingers crossed it holds!
