The jubilee clips are from DIY balancing. If it has worked, they are effective and you might as well leave them on. You might have some rectangular plates welded to the tubes and this is the original method. A good prop shaft shop can balance the complete shaft dynamically. They can swap in new U/J's at the same time. Not too expensive. I know you want to do as much as possible yourself but as you say, doing trial and error balancing with clips is no fun.
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