Yes, the basis for those curves was originally a surface intersection. The surface intersection curve was then scaled to create two other curves (a bigger one outside the ring and one smaller one inside the ring) and then those two curves where used to create the loft which was then used to boolean out the holes. I'll experiment with the 'rebuild' as you've suggested and see what I can do.

Thanks!

*edit* Oh wow, I just saw your 2nd post with the file attached. Thanks again!