Rest-assured - the slight gap/clicking is normal. I noticed it when I first got mine back in May also, but I read on this forum that others had it also so I stopped concerning myself about it.
When I read your post, I pressed mine together and heard it. This morning I pressed it and it’s not there so I pull on it slightly and it’s there. Just leave it alone and don’t worry about it - I find it a bit reassuring that there’s a bit of movement actually. I see it as less rubbing on the gold.
As for wear, I wear mine 24/7 and really it’s so comfortable I got used to it from the very beginning (sleeping with it, working out with it, etc). I do protect it as much as I can when I can such as a wristband on for doing housework, etc and honestly, I have very few & minimal scratches on it. You can’t really tell unless you inspect it very, very closely. I’d say the most scratches I got on it were within the first 3 months - the adjustment period. However, it still looks really shiny and new.
Also, since day 1 when my husband screwed it in my wrist, not once have we had to tighten it. It’s secure. Another trick is putting tape on the screwdriver I have read to avoid scratches when you have to use it.
I love wearing it! Planning to add a thick one with it next year!
Hope that helps! Enjoy!