Could you please test if "take down" skill is still bugged or not?
It does consider spear damage.
Undead don't take health reduction damage, so take-down doesn't do much good there.
Also, with normal attack you get chance of 'Pulvarize', 'Disable', 'Shield smash' skills used. Which add more damage to the attack.
Damages are not consistent due to following factors:
-randomization
-region where attack hits (torso, head, leg, arm) // this is one more type of randomization
-enemy stats (gear, resistances, defensive ability)
So it's hard to give exact difference between the attack types.
Following is combat data(legendary difficulty) with:
Hector's spear
+32% physical damage
+14% physical damage
+30% pierce damage
Take-down level 16
45% reduction to enemy health
187 piercing damage
Here are 3 hits and 3 Take-Downs on Zombie undead
Enemy : Zombie\Greece_AM_Festering_06.dbr
3 Normal hits
------------------------------------------------
Total Damage: 675.011658
17.995949 of Physical +14% Physical
355.492493 of Physical +32% Physical
106.209885 of Pierce +30% Pierce
Total Damage: 968.762146
36.095795 of Physical
554.903442 of Physical
147.314560 of Pierce
Total Damage: 663.986816
20.220663 of Physical
340.837708 of Physical
103.296539 of Pierce
3 take-down hits
------------------------------------------------
Total Damage: 782.884644
84.261894 of Pierce
25.579756 of Physical
356.581787 of Physical
106.426422 of Pierce
Total Damage: 744.677612
84.261894 of Pierce
25.253668 of Physical
325.510681 of Physical
100.249557 of Pierce
Total Damage: 860.756470
84.261894 of Pierce
23.861380 of Physical
425.755920 of Physical
120.178078 of Pierce
These are 3 hits on sytyr archer
Enemy: Satyr\AR_Archer_06.dbr
Satyr archer
3 Normal hits
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Total Damage: 1437.583618
34.146088 of Physical
650.855469 of Physical
525.918457 of Pierce
Total Damage: 968.318665
20.475523 of Physical
390.164124 of Physical
357.552399 of Pierce
Total Damage: 1172.008911
28.510330 of Physical
500.886780 of Physical
426.888306 of Pierce
3 take-down hits
----------------------------------------
Total Damage: 1257.109131
294.916656 of Pierce
1015.068054 of PercentCurrentLife
18.763828 of Physical
389.492737 of Physical
357.131989 of Pierce
Total Damage: 1242.278564
294.916656 of Pierce
622.773987 of PercentCurrentLife
19.494986 of Physical
379.050659 of Physical
350.593048 of Pierce
Total Damage: 1269.624268
294.916656 of Pierce
302.629425 of PercentCurrentLife
19.119633 of Physical
396.545105 of Physical
361.548248 of Pierce