Originally Posted by
Moe Zhoost
...Have you measured the thickness of the rings? It may be that the aluminum ones are a bit thicker than the steel ones.
^^^This, I think.
Steel rings have always given me top shifting performance, even as I have had shifting issues with OEM FSA cranksets on one or two occasions.
Assume nothing when it comes to the chainring's tooth-center offset from it's mounting surface.