The easiness of dissociation of antigen-antibody complex depends on the binding affinity of the antibody to its target antigen. Typically, commercial antibodies have good enough affinity to the antigen that should be easily ripped apart by just centrifugation. However, it's the high speed spinning you should worry that it could potentially damage the live cells you are staining. Keeping the cells on ice while staining is not so much to protect the antibodies from dissociated from cell surface antigen, instead, it is to prevent the live cells to internalize the antibody bound antigen via endocytosis.

Fluorochromes are covalently attached to antibodies. Centrifugation will not cause them to fall off. Sometimes, the covalent bond is relatively unstable and the fluorochrome will gradually come off, but this will not be affected by centrifugation speed.

Antibody that is bound to the cells should not be dislodged by centrifugation, but what does happen is that you separate the cells from the antibody that remains in solution, thus ending the binding process once the pellet is washed. This would be the same result at any speed that is sufficient to pellet the cells, however.

Thank you all for the answers. I analyzed the cells and results were quite normal and well. I think I was just too anxious and 6000 x g is so much larger than 200 x g lol. Should have believed in the (covalently binding) power of nature.

Thanks again!