i wouldnt recommend shuri sub, instead using lancer sub would be better. Then u have the krit sdn from the second weapon + its a dark based class for additional damage through eido/mount.
I am using this tree:
I'd only recommend Lancer sub to people who are willing to micro manage their marks and are fine dealing with long cooldowns. Shuri is just the lazy version of it. For me personally, I've run both and prefer shuri purely for not having to deal with stacking marks