Gear used is shown at the end of the video.

Timestamps:
00:00 Swallow soul 1st test,
00:44 Force pulse 1st test
01:31 Elemental weapon 1st test,
02:13 Swallow soul 2nd test,
02:55 Force pulse 2nd test,
03:41 Elemental weapon 2nd test,
04:24 Swallow soul 3rd test,
05:05 Force pulse 3rd test,
05:51 Elemental weapon 3rd test,
06:35 Gear used - Food - Potion,

All parses are supposed to last 40 secs, until the merciless resolve buff is over.
Since i was using bloodthirst jewellery, dummy hp had to be at %100 in every parse.

Conclusion of this test is, while swallow soul and force pulse are performing the same, elemental weapon clearly got me 4-7k extra dps.