thanks. cc. I bought the bag when I couldn't hit one so it'll do until it gives way, then I'll pick up a top quality peanut. The same story goes for the swivel.

I actually corrected the problem last night after mucho brainstormo. All I did was tie the bag loop to the swivel chain with a shoelace wrapped around as many times as it would go and as tight as I could make it. The rebounds are now pretty true...true enough that I can hit it full tilt indefinitely without wobble. It's still not as PERFECTLY true as your set-up, but it's pretty close.

Simply put, the bag was hangling from the swivel facing 90degrees in the wrong direction.