I am using the following settings on my 3a and the result has been incredible. I always use it with the HDR+ Enhanced enabled.
ADVANCED:
HDR+ control: On
PX MOD SETTINGS:
Synthetic Fill Flash: Off
Disable Focus Tracking: Off
Disable Motion Photos: On
Non-ZSL Frame Count: Default
Maximum Zoom Level: Default
Super Res Zoom Always On: Yes
Force Sabre Merge: Off
DCI-P3 Color Space: On
Portrait HDR+ Enhanced: Off
AI AWB for ZSL: Off
AI AWB for HDR+ Enhanced: On
AI AWB for Night Sight: On
LIB PATCHER:
Tone Curve: On (with default and stock settings)
Shadows Point: 0.33 (Default)
Highlight Points: 0.33 (Default)
Shadows (Lower Curve Half): -6 (Shadows Stock)
Highlights (Upper Curve Half): 15 (Highlights Stock)
Force System Noise Model: Off
Disable Dehaze: Off
Sharpness: 0.125
Saturation: 1.5
Global Luma Denoise: 1.0 Default
Global Chroma Denoise: 1.0 Default
WAVELET LUMA DENOISE LEVELS
Level 1 (Fine Details): 0.375
Level 2 (Rough Surfaces): 0.375
Level 3 (Edges): 0.375
Level 4 (Smooth Surfaces): 0.5
WAVELET CHROMA (Low Frequency) DENOISE LEVELS
Level 1 (Fine Details): 0.375
Level 2 (Rough Surfaces): 0.375
Level 3 (Edges): 0.375
Level 4 (Smooth Surfaces): 0.5
WAVELET CHROMA (High Frequency) DENOISE LEVELS
Level 1 (Fine Details): 0.375
Level 2 (Rough Surfaces): 0.375
Level 3 (Edges): 0.375
Level 4 (Smooth Surfaces): 0.5
Is an adaptation of the settings that the
@Gnaius posted here previously. Tell us how these settings work for you.