The opening vocal has a different quality, is that the new kid? A chompier attack, more vibrato, more energy. Closer to human.

Excellent production, but of course, of a solid composition.

I hope you don’t really think of these pieces as mere demos because the singing is synthetic! No, it is not human singing, but it is what it is and you are VERY good at making it happen. You are building a set of compositional techniques with this software analogous to what a particular singer masters when developing their individual physical body and understanding of how to drive it. The better the software gets, the more distinctive your singer will be, so, lean it to it, I say. Your singers need not look down and drag their toes in the dirt when a human walks past.

PS – It is good, I think, not to overly focus on the synth aspect by posting the bot specs in the title. One actually has to read through your post quite a ways before one gets that, oh, this will feature an other-than-human singer, and I like that. Music and words, that's what we have here, who or whatever sings them.