Ok, so I'm getting closer to my travel dates and while I've cleared my TATL segment SWU for the way there, on the way back inventory is looking tight. My flight is Nov 15 and there are four J seats available according to ExpertFlyer. However, there is another flight that goes through a different connection that seems to have a lot of open J space. Should I switch to the other flight? Would switching to the other flight mess up my existing SWU? I am kind of loathe to change anything before flying that confirmed segment, but if I wait it will likely cost a lot more to switch flights.