you are right,not many F sectors.I thought longest routing would have F,but no. In that case DONE is more acceptable.
IF I want to have F routing it also would be CX heavy with only few other Fs, and SWP will be out of the game,only from/to SYD is F served nothing else in SWP.F Routing like this:
MPM-DOH-LON-HND-HKG-PEK-HKG-JFK-YVR-DFW-LAX-DOH-CDG-MAD-DKR

where I am OK with C on mpm-doh,yvr-dfw-lax as from MPM no F,and LAX is a must, but I am not happy with final sectors CDG-MAD-DKR, but I didnt find other valid route to end RTW correctly.