I did the return trip, Hawaii
to San Francisco
, many years ago... returning a friend's Traveler 32 after he did the SF-Hawaii Transpac singlehanded race
. I've started a blog with that trip as my leadoff story, if you're interested: Saltwater Seamanship | Valuing a Saltwater Sailing Education
I have the impression that many of those Transpac racers do not want to do the return trip and there'd be opportunities to get on board a boat coming back, which would be end of August, into September. You might want to check out the Transpac organizing websites. It's a great trip. Good luck!