I would highly recommended using both of trigger words, u usually will get better results.
Also, couple of recommendations:
Use lawlassYiffymix20 for results as showed on the page
recommended clip skip 2
set around 0.9 scale (I was using exactly 0.9)
the model trained on 512x512 images
If you dont get good results, write an feedback with your generations. I'll try to fix this.