Billi, I would go with the Piec-lique technique for the curves on your double wedding ring. Here's a link for a great tutorial. (It's for Drunkard's Path, but it should work fine with your DWR.)
http://www.sewmuchlikemom.com/2014/0...iec-lique.html
I used the technique for a drunkards path I did and it was awesome--all by by machine, no pinning, no matching to worry about, no bias edges to fuss with.