I did my own little researches and here are my results; on a 40 armor and 64 HP enemy with a 42 cut polearm, it would go like this:
At lvl 30:
24/15 (8 ps): 38.6 / 57.8 head :1-2 chest :2-2 hand :2-2 legs :2-2
30/9 (10 ps): 43.7 / 64.2 head :1-2 chest :1-2 hand :2-2 legs :2-2
33/6 (11 ps): 45.8 / 66.8 head:1-2 chest:1-2 hand:2-2 legs :2-2
36/3 (12 ps): 48.1 / 68.7 head:1-2 chest :1-2 hand :2-2 legs :2-2
At lvl 34:
30/15 (10 ps): 45.7 / 65.8 head:1-2 chest:1-2 hand :2-2 legs:2-2
36/9 (12 ps): 49.9 / 71.2 head:1-2 chest:1-2 hand :1-2 legs:1-2
42/3 (14 ps): 54.1 / 76.6 head:1-2 chest:1-2 hand:1-2 legs :1-2