Just keep at it, you will get it eventually
Our group sailed for 6 hours just to get to the island but we all eventually got it... then of course there was a rollback and I had to get it again but finally did it
GOOD LUCK!!
I agree, it is beyond ridiculous the spawn rate now, kill 5 lions and a handfull of giant snakes just for them to respawn in 5 minutes and have to try kill them all over again, this can't be working as intended.