Since the new Harpie deck available, I have never won a single ranked duel using a Harpie Lady deck. I used the same recipe as you all here. It's just I always get mirror match, going second against already established Cyber Slash or Heraldy XYZ field.
One time I got first, I choose XYZ to Heraldy. And it turns out the Mai I'm facing uses a Blackwing deck instead.
My deck is like Gorilon's recipe above, except few things: I do not use Atmosphere, I use different XYZs (Heraldy, Gagaga, Roach, Abyss, and Sin), and I use Last Will Skill instead of Hunting Ground.