Your question would get more input from the US Airways board.
US & UA offer saver awards and standard awards and a higher level. The higher level gurantees you seats on US Airways but you must may the 160K level. The awards at 80K are available but harder to find.
If you call US Airways they should be able to help you find *A tickets for the 80K level. It may go quicker if you suggest what your finding on the ANA tool.
The following came from the US Airways site
Star Alliance and Other Partner Award Travel
Award travel chart
To book award travel on Star Alliance and all other Dividend Miles partner airlines or if any portion of your award travel is on one of our partner airlines, call 800-428-4322. To book award travel on Big Sky, Hawaiian, Royal Jordanian or Virgin Atlantic airlines, call 800-247-5691.
A $15 service fee* applies to all tickets purchased through Reservations.