Same problem here.
I think the problem is the Loctite or whatever is on the thread.
When you first fit them and turn the bolt it is really, really stiff because the Loctite is holding but once you have adjusted them up to suit your particular pole section - (they are all different) the "fix" of the Loctite is broken.
I can manage with adjusting them - just about
but I reckon some fresh Loctite and then adjust them to suit and they should be fine.
Maybe instead of pre-treating the threads with Loctite which then has to be "unfixed"- a little sachet included with the clamp set may be a better option.
This could then be applied and the clamp set to suit and the Loctite should hold.