@CinCameron20
Kanzaki can fight Carissa (who's stronger than her), Knight Leader and the nerfed Acqua (who are comparable to her as Saint level fighters) at the same time to a draw. All three of them are very skilled fighters and sword users, with Acqua and KL being capable of fighting Curtana Original Carissa shortly after their own fight, not at 100% strength and while being totally incapable of actually parrying her sword strikes like Kanzaki could do. Kanzaki has also been said to be one of the Top 10 magicians in London, and Britain is one of the strongest magic factions in Toaru's world. Calling her an average fighter is clearly downplaying, and she has an entire novel where she spends her time coming up with plan and counters for Norse Myth magicians, which isn't even one of her branches of magic as an Amakusa.
Note that unlike you I didn't dismiss Zoro's skils, I just claimed that Kanzaki would have a slight edge on it. While skilled IMO Zoro as a swordsman relays more on his strength and endurance, even after the timeskip. With similar speeds trying to backpeddle means little when Kanzaki will chase him and can likely use magic to move faster than him, he's not going to gain enough ground for his range to do much, considering Kanzaki can and will simply cut his ranged slashes in half. I have never seen him as a type of fight genius or a specially tactical fighter, but if you can find an instance of him coming up with a plan to overcome a stronger opponent I'll concede that he's better than what I though at doing that kind of thing. Though there's really nothing much for him to exploit from Kanzaki except Yuisen using her stamina faster than usual, which is not a problem when she can oneshot him with it.
OP's Haki is helpful, but is not going to give him the victory here. The limited precognition it gives obviously doesn't work 100% of the time. And he won't be able to sense her with Haki if she tries to hide with magic, the hiding spells in Toaru work specifically to hide your presence from anyone outside the field, and even a lower tier magician like Oriana can mess with sixth senses and intuition type abilities. Not to mention Kanzaki has fought and held her ground against Carissa in two occasions, and Carissa can use magic to gain a sixth sense to read and predict the flow of battle and the enemy. This is a minor spell she and the Maiden of Versailles use, so it might be something fighters of that level like Kanzaki have; and even if she doesn't, Kanzaki has already proved herself to be capable of fighting someone with a sixth sense like that, so it won't be an issue on this fight, leaving Zoro's highly superior endurance and stamina as his major advantage right next to range, and I already explained why those aren't enough for him to win.
Yuisen is a technique, not a transformation. And I don't see what you mean with her tier being circle power-scaling; Saint level fighters have a statement, power-scaling to Gabriel who has feats on the level of the statements and higher plus a calc from a weaker magician failing to do much against one of them.