Melee Moes

I've been leveling my new Rouche Mode:F, and I've been enjoying punching things out of the sky.  I've already got a build idea in mind for her to capitalize on her punchiness.  I'm wondering, though:

What stat do her weapons run off of?  In particular, I'm wondering about her stun shot and the slash waves generated by her melee attacks.  I'd like to be sure before I start tuning away stats.  And what exactly does her EIW cart actually do?

Also, I just got started using a Lilu Fenshi, and I noticed that her AMs are removable.  Does she have any variants that offer alternate AMs or weapon cartridges?  Does she need both Lilu AMs equipped to complete the cooking combo?

On Lilu: She needs both carts on her arms to complete the cooking combo, otherwise she'll just do empty lunges. And she has no variants.

Mode: F's EIW increases the stunshots AOE and duration time - or at least that what it seems to me. Idk if her melee gets improved (shockwaves maybe?).

rouche's melee is str, same with the shockwaves
the stun ball might be tec, don't remember
I'm sure the eiw does shit, not like you really need it either way

AFAIK the only benefit on Lilu's removable arms is that you can add arm joints.
But if you add Asura AMJ then you can't put on Lilu's arms.

rouche stun ball is str-based after testing

you can give lilu dinkleberg amj for shields(ugly) or 1 beam cancel amj ( to troll airs) for shits and giggles. idk if its a good idea or not, but i really want to tune eternal on her head. damn thing keeps on breaking so i lose out on the support reject thing.

I want to tune this Rouche, but her capa is just too low to fit much. But her weapon and attacks is pretty well thought out. Just wish for moar capa.