Cutter has a decent body, thats equal to the Aetherial armor there.

Cutters had a decent helm, but thats honestly all ive ever seen drop in cutters, and ive done it a lot. so im not sure if cutters is going to help enough.

just keep doing the 1st 2 bosses, and hope they drop some aetherial plate.

I also did Qarn before cutters, so i had that armor going into cutters. And Calvary into Qarn.

WAR will have a harder time, but make sure ppl sleep adds (cant sleep Aevis) and save cool downs for 3+mobs or 2+ strong mobs.
Use your stun to help lower incoming dmg, and all the basics.

Otherwise, its all about pulls (like the person above said).
When fighting the sprites, run circles around them, and they cant hurt you.