No it's not what you think I just installed renthal bars and the holders are on all the way tight to spec but I can still move the bars if I really push up on then. Is it ok if I take both top pieces and shave them on the belt sander a tiny bit, or is this a no no?
I think it's fine the way it is. You want some amount of give under high stress to help minimize bending the bars.
If you find the bars are easily movable while riding then it's too loose. It sounds like you have to exert quite a bit of force on the bars in order to make them move, correct? If so, can you exert the same kind of force while riding? If not, don't worry about it. You're good to go.