About the difference between premium supports.

I currently have Durin and Mona (C1) built. I don't have Citlali or really any other premium supports for Chasca (except maybe Bennett and Columbina?). How close is Chasca's DPS with a Durin and Mona team vs a Mavuika/Nicole and Furina team? Do I need to pull those other premium supports?

Regarding the third slot, is overvape better than melt/vaporize at C1R1? I have a few electro supports (Ororon, Iansan) I can build and I don't know if it would be better to build them, someone like Charlotte or just use Bennett/Xiangling instead.
Character builds here: https://akasha.cv/profile/686399689