Still testing. This was actually trained on Pony, but seems to make better Illustrious images than Pony, so playing with that for now.
I've found best result so far using
cfgScale:4.2 -4.5
steps:28-32
sampler:DPM++ 2M Karras
lora strength: 0.8-0.9
Messy_Blonde.safetensors