I honestly don't think that coil should be nerfed anything past the current 1-5 turns.

Many people who complain about it being too hard seem like they haven't really tried. Or they have a solution already in their problem. Usually that all their friends are stuck on T5 as well. So get those friends and go learn the fight together.

God forbid you have to put some effort into something to progress.

I don't really care either way, I prefer to learn fights and love the challenge of coil.