I suggest you change the seating config. First check for Club or First Class demand and meet only what is there now, and then upgrade your Tourist Class seating (which means fewer seats and less load so more fuel). If you don't fancy that then do a Tech Stop at Shannon(historically) or Dublin which is (today RW) winning pax by offering USA Customs Clearance with shorter range for the airlines (they just pack more pax in).
I am not sure Sammi has allowed some Pax to be collected/gathered at Tech Stops. He felt it would lead to aircraft not operating mainly from their bases.
It will be interesting to see who does the first London - Sidney.