Changed out my middle chainring (32t) with an FSA and the shifting and fit is not as good as the original Shimano ring was. I am considering switching back to a shimano ring, and would like to try the composite/metal middle ring. My original Shimano middle ring was all metal. I read one comment on line that mentioned the composite/metal rings may not be compatible with cranks (M660)that came with an all metal middle ring. Can anyone verify whether this is true or not.

Secondly,
Does anyone have any pros or cons re: the metal/composite ring?

Thank You
urmb