That happened to me at first as well. What made it feasible was to reconsider how I was approaching the fights
spoiler
literally: approaching a worm’s tail, while keeping the head as far away from me as possible, let me kill the worm before its cloud and eruption attacks ever reached me! Took about 4-5 rare uranium cannon shells to kill it in around 5 seconds, tops.
Congrats for sticking it through!