Yes, as others have noted, ground sectors are included in mileage for DCIRxx fares. And so many of my tested options end up less than 30 miles over.
I would really like to go through DFW on the way to PHL/BWI/JFK. So it looks my best route is BNE-LAX-DFW-PHL-DFW-NRT-BNE. But no skybeds of CX WB to be seen, just QF Dreamtime and AA J seats all the way. But it is worth 600 QF SC's. And no chance to use my UC's to get into an F cabin

.
Now I wonder if I can find a CX codeshare on LAX-DFW to get the 15,000 point bonus before the end of November? The BNE-PHL will be in November, the return in early December.
Maybe I should start to look at the additonal cost of DCIR26??