I'm not an expert but when it comes to Kushina, you could try running the Kushina - Bee 7S - Kazekage Gaara team or Try to get Edo Minato as new pos 1 ninja, or combine Kushina with Edo Yagura and Water main while trying to 4* her. Another option is to go for akatsuki team aiming for Kakuzu Online (EGF) and Konan + (the Deidara u have or Kisame)

I think your team looks great, honestly, and ofc there's room for improvement. I don't see Edo Deidara as position 1 these days. You can get creative and decide what u really want to aim for.

Good luck!