In that bottom picture you have a good shot of the rocker block mount. When you mill that off far enough to get a Jesel or T&D system in there, it's very weak. That's one reason why I kept on working with the Chrysler system, as I'd seen some failures with the spring loads and RPM I was using when milling them down.
I'll go out in a bit and take a picture of the W7 mounts and you can see the difference.
Not many bracket guys were shifting at 85-8800 with 340 on the seat. I'm the odd duck.