My Recommended configurations
VAE: none
Sampling Method: DPM++ 2M Karras
Sampling steps: 28
CFG scale: 6.0
Scale: 768x1024
Upscaler: any
Hires steps: 30
Denoising Strength: 0.3
Note: In the upscaler configuration keep Hires Steps up to 30 max and denoising strength between 0.3 and 0.5 for optimal results.