A shuttle 3.0 selective block merge with shuttle 3.1 to produce shuttle 3.05, which reduces the harsh sharpness of Shuttle3.1 somewhat, and gives an image somewhere between the two.
Ideal sampler settings are: Euler / Beta - 4 Steps
The versions are in order of quality and size - FP16 being largest best and Q3 being smallest and the least quality (but still good)