You may be able to maximise the QF SC's and points a little better if you try. Consider CX 7505 BOS-SFO. This flight is 2704 miles, which puts you 4 miles into the 2700-5000 mile range for SC's.

AY also codeshare with AA on some domestic services and some services to Europe.

Is BOM a place you want to visit or just included for the miles? If just for the mileage, then look for something over 5000 miles out of LHR (LHR-BOM is only 4487 miles). Its worth it for the SC's.

Whenever possible, try to enter a new continent at a port on the far side. ie From SWP to USA, try to get to the east coast (something like QF107 SYD-JFK or CX HGK-JFK). And try to leave from the wrong side also, such as heading to Europe from US west coast. SFO/LAX/SAN-LHR are all just over 5000 miles, but you won't find AY codeshare direct to Europe from there.

You have only used 18 segments all up, so still have two more. You have only used two in SW Pacific, so could add two more domestic Australian flights. SIN-PER is only 2400 miles, so only 20 SC's in L. SIN to any other Australian port (except Darwin) is over 2700 miles, so earning 25 SC's. Better still of you can get over 5000 miles, but the only options I know of between Asia and SW Pacific are HKG-AKL (and you kit NZ outbound, so can't inbound) or NRT-MEL. Over 5000 miles gets 40 SC's on L fare.