I inspected the prop from our floating dock with bright sunlight and clear water. I don't see any issue with the prop. I pushed and pulled on it with a boat hook and didn't feel any slop.
I didn't try it in reverse - thought about that on my way home later. What I think I'm hearing is more like the clatter noise reverse always makes. I guess I'll take the cover off and see what I can see.
I can't imagine the prop shaft would be doing it with the bit of vibration it has.
It gets worse with higher rpm. The engine videos were shot at a bit less than normal cruising rpm. The lazerette video was somewhat slower I think.
I changed oil to Mobile 1 4T motorcycle oil before the trip (300 or so miles all together), but of course only about half of the oil gets changed out so it's a blend of dino and synthetic at this point.
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