Kephren can go to Carter for a back-up shot, and people might not expect him with the already huge life gapping Berzerk cards. PCats and DR's are popular so you might find him useful, might not.
Miho can go to Cornelia for a more stable power against SOA and stable damage against DR but it's a trade of Extra Damage for Stability in my opinion.
Good luck! : )
Maybe instead of relying on defeat, which 5/8 cards in your deck do, replace Kephren with Minerva and Elvis to Uma/ Lola to Esther. Minerva can win, but if she loses, DR. While SOA is important, what if you draw 4 Defeat cards?. Esther is OK, but Poison is valuable. Or you can use Cornelia. I see you tried pillz manip, so base it around that or something.
If Graven is unbanned, I'd probably use the 5/3 suggested by wats_happenin as my preference for this clan combination.
With all respect to troll4663 for contributing to the thread (which I totally encourage), I feel like any configuration including Uma, Esther, Saho or Belle is a downgrade. You want to drop Lola (?!) or Elvis (?!?!) for those borderline-terrible characters just to upgrade Kephren to Minerva?
To be honest, the current deck isn't too bad. The choice I'd be most concerned with is Miho (who has her useful moments, but is a little shaky). That is easily fixed with a switch like DUC-j00 suggested (though I'd pick Chiara Cr over Snowflake for my preference).