Hoping I could get some help here. For reference, using Bambu Black PLA Basic, 30/30 looks best from the calibration test.
Current settings:
Ironing speed: 30 mm/s
Ironing flow: 30 %
Iron line spacing: 0.14mm
Ironing inset: 0.1mm
Top surface pattern: Monotonic
Top shell layers: 10
Sparse infill density: 20%
Sparse infill pattern: Gyroid