The very small quadrant of the import surface is the biggest problem. I have not found a good way to to get this to be reliable.
Once I have a closed surface profile, I would consider working with new Creo surfaces to create the hole details using a revolve feature. You can then merge these features into a single quilt and provide a fillet (round) of whatever radius you desire. You will also not need the 10.2mm offset for the outside of the bosses.
Have a look at Independent Geometry un Get Data. This may help in re-creating the original import surfaces without the holes.