Autotune Polish for Finished Track

I have a single stereo .wav of a studio-recorded song featuring female vocals. The performance is good, but I can hear moments where the pitch could sit tighter and a touch of tasteful harmonization would really lift the chorus. Unfortunately the vocal stem is unavailable, so all work must be done directly on the full mix.

Please work in Auto-Tune by Antares; if you need to pass the audio through any other complementary tools (RX, Melodyne, Waves, etc.) to achieve a clean result, that’s fine as long as Auto-Tune remains the core tuning engine.

What I’m after
• Subtle pitch correction that feels transparent and musical, avoiding the obvious “robotic” sound unless absolutely necessary for accuracy
• Light, blend-in harmonization where it adds depth (mainly on hooks and ad-libs)

Deliverables
• The tuned, ready-to-release stereo master in the original resolution
• A brief change log (time stamps or bar numbers) so I can hear what was adjusted

When you respond, focus on your experience doing vocal correction on mixed material; links to before/after examples of similar work will help me choose quickly. Thanks and looking forward to hearing how you can refine this track.
Original song with original lyrics written by the female artist.