What is this stuff about 4 strokers throwing props when lean?
I have experienced it, in particular with a GP SS 40 powered by a 48 Surpass some years ago, that kicked the prop off in flight more than once.
Do you have any idea how long it takes to find a prop, spinner and prop driver in a field? I do!
The prop kicking tendency seems to disappear once the engine is run in. Until then, as advised, keep it on the rich side.