Which comp?

As of now, my comp is composed by: Vildred (main DPS), Haste (secondary DPS/debuffer) Achates (healer/cleanse) and Tywin (tank/buffer)
I also have Charles, Montmorancy and Lots benched, and I’ve been thinking about bringing in both Charles and Momo (once Momo hits her SC). My main concern is that Charles isn’t a real tank as Tywin, and my comp would also lack the Defense Break Tywin provides, though it would have a lot more raw damage.
Any thoughts on these possible changes?

P.S.: I also have a benched Aramintha, though I’m not a big fan of her kit.