Dont't forget to maximise the value of the intercontinental flight as well.
For example, if travelling eastwards (which I know is your less preferred option), travel directly to JFK (eg on QF107) rather than disembarking on the west coast at LAX, SFO etc. From there, you can work your way back westwards, and you still have the single transcontinental flight up your sleeve.
For my upcoming xONE4, I am doing SYD-JFK,EWR-ORD-SFO-LAX-IAD-DFW. The LAX-IAD leg counts as the transcontinental. I then leave N.America by DFW-FRA, adding extra mileage to that intercontinental leg as well. This, I'm sure, is not as honed as it could be, but sufficed for my basic requirements.
You may, of course, already know all that!!
