I remember my first maelstrom arena clear. After hours of huge frustration, I quit on stage 5. After about a week I came back again and got to the last stage. One week later I beat it for the first time, a did not touch it for at least 3 months, probably closer to 6. I did not know that that was only on normal lol.
When I finally did attempt it again, it was quite a bit less frustrating than my first attempt, bug this time it actually was in vet. By my fourth clear, I could get to stage 7 without deaths. At this point, I have cleared every stage without a death, but not all in the same run.
Good job, OP. When you do finally try it on vet, you'll have quite a bit easier if a time now that you have a feel for the mechanics. But make sure you take your time to rest up from that ordeal. If you do that, while knowing your character well, you COULD get flawless in under 10 tries.