Anthony RS

Hello! I just checked my Newtonian's primary mirror clips and they were really tight (from factory). I loosened them a bit (fits a business card or a bit less) but I noticed when I move the mirror from facing the ground to facing the ceiling, the mirror is moving inside the cell ( towards the ground it's touching the clips, and towards the ceiling it's not) which if I'm not mistaken could lead to tilting the mirror and losing collimation when using the scope on the field? Is that normal or should I tighten the clips a bit more? From what I read, the mirror should be able to rotate inside its cell so maybe I should tighten the clips just so the mirror can still rotate but not tilt (up & down) when it moves? Appreciate any help on the subject. Cheers! -Anthony