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Can you do me a favour Steve?
Drill a 8mm hole in a spare bit of ply, and bolt one of those struts hard onto it then give the top of the strut a jiggle. Does it move?
I have a sneaking suspicion that the flange may prevent the insert from getting enough 'bite' to make it really solid, and that tightening it will make no difference as the flange will just sit more firmly on the ply rather than stiffen up the assembly. On the other hand, I could be completely wrong!
In dob building, your optics are only as good as your loosest strut ...
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