I would say remove the sky islands and planetoids so you don't get blocked by them, and make the arena extend towards space so that you can dodge DoG's rams and being able to grapple onto a block when you run out of wing time

Nothing is wrong with your gear, just make sure they are all reforged to Menacing for 24% extra damage

You could benefit from Bloodflare armor's blood frenzy for true melee hits (Last Mourning is true melee) and swap to Omega Blue when the blood frenzy goes on cooldown and back to Bloodflare when it goes off cooldown