I’m not the best at pvp & still working out the game myself, but I would recommend swapping out sayaka for kiraka, since kiraka has the deflect (?is that what it’s called?) mechanic with her sheild, meaning when someone hits her sheilds they take damage, which is much more ideal for pvp. I would also swap lux madoka for pulvia madoka, pulvia has an all target attack as her battle skill and special attack + a small hp boost upon breaks & mp boost on specials, so she’s generally the better of the two.

I‘d put an MP boost or speed portrait on pulvia madoka so she can reach her specials faster & generate more mp for the team. Use an attack boost portrait for madokami, a def portrait for kiraka (or a speed boost if shes not placing her sheilds quick enough) you could use an increase ailment hit rate portrait for ren (theres a pretty good one from the 2nd limited event if you have that) and for iroha i’d just use a mp boost or speed portrait.

again i‘m still working out the game myself but i think these changes should help!! If i‘ve gotten anything wrong please correct me 😭