STEPS BASE (after this value the refiner kicks in) should never exceed the value of TOTAL STEPS unless you want to use only the first KSampler.
I like 10:14, increase total steps for realism, these are set for models in suggested resources, Uncanny valley and Fabled Illusion XXXL - (N/SFW), I really recommend downloading them, both are the best I found for their respective roles, feel free to comment your best values!
The main appeal of this workflow is using illustrious/noobai-xl model to setup complex poses or characters and refine it with an sdxl photorealistic checkpoint.
Version 5.5 has additional 1080p version file.
I don't make new versions for small quality of life updates, download the file for the latest version.