I was just using awardnexus today and noticed that there are *lots* of options in saver J for my upcoming trip to SGN with a combination of NH/BR/OZ/UA. I didn't get creative enough with the routing when I did my original booking. I'm sad I paid $4k to use 4x GPUs for 2 pax when I could have booked saver J. I almost considered forking over $800 to cancel and rebook with points (guaranteed J seats vs. upgrade lottery on UA metal).
If you haven't used awardnexus, I'd highly suggest looking at it. It was certainly an eye-opener. I didn't realize you have to manually specify routings (UA.com doesn't, by default, show the best options).