Questions regarding Ineffa vs Columbina (Varka potential leak mention too)

I like Flins. I consider myself a near-endgame player, but I took a break around the time Fontaine released, so my character roster is a little bit limited - I have a few of the new 6.0 units, Lauma C1/EventR5 (as my returning first 10pull kekw), Flins C0 with SoSS, Aino at C4, and a decent enough artifact set for Flins and Lauma. I've been able to clear Abyss, albeit via some panic-pulling for Arlecchino (which was actually a good enough investment now that I look back), and getting Durin/Varesa/

Preamble out of the way, I run Flins/Aino/Durin/Fischl, and am wondering if replacing Aino>Bina or Fischl>Ineffa would be better?

P.Amber is 100% going to be the weapon I would use for Bina, but what should I use for Ineffa? Is Shovel her BiS 4*? I have PJWS on Arlecchino, but would it be better than Shovel?

Regarding artifacts, the new off-field Lunar reaction set is Ineffa's BiS instead of Silken now, but Bina's best set is Silken? Or was I lied to by the few posts I skimmed?

Varka Leak below!

!Or should I just save for Varka considering I have Venti/Durin/Bennett as his projected BiS team xd!<
Varka Leak above!

Any notes are appreciated, and I'd share some screenshots of my roster to help with ideas but servers are down for another three hours lmao. Will update if/when I have more questions and servers are back on :3