Can you post a pic of the gap between the smallest chain ring and the frame? I realize it is prob not possible as you have dismantled, but it is entirely possible that we can help improve the chain line somewhat.

Sealed units are great, not original, but I prefer them, admitting I am not running anything top end so I am not in a boat where I would need to run a ball and cup system for Suntour or Campag group sets.