1) you can't go back through SYD -- once you're there, your tour is over. Better SWP sector is (HKG-)AKL-MEL-PER-CNS-SYD.
2) there is no ORD-ANC. N.Am sectors also contains a short trip from NYC-ORD; try something like JFK-SJU-LAX-DFW-ANC-DFW-SFO-LHR.
3) you can go to KHI instead of BOM for a few more miles...
Hope this helps.
CT