Do yourself a favor and leave and requeue. This is honestly what everyone should be doing with the way it's designed.
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If this content is set upright or not. SE will adjust the rate.
Looks at fates you can solo all but 30 min fate with adjustments made. I am an 80 fish. I haven't gotten around to doing this content, but I'm not worried.
I'm kinda sure that the spectral pop rate scales with the number of people on the boat. When I'm alone or with 1 or 2 people it almost always pops when one spectral fish gets caught, sometimes it requires 2 catches. While when being on a full ship I can have 5 or 6 catches across my party, without anything happening
that said: having people leave the ship probably doesnt hurt you, because the spectral pop rate per catch might just increase