Flamethrower gun overpowered in combined arms

Product: Battlefield V
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number 1080 TI
Enter RAM memory size in GB 16
Are you using any software with an overlay? No
Which part of the game is the issue happening in? Multiplayer
Which part of the mode? Combined Arms
Please select your region Europe
On which server did this happen? Marketsweep
When did this happen? (dd.mm.yy hh:mm) N/A
Summarize your bug Perhaps it's intended but personally it is ridiculous how many shots i need to do with the Johnson. Head shot is 3 times. So 3 shots on head. Then with this flamethrower pistol it is more powerfully then a V1 rocket.
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? Use flamethrower gun in combined arms
What happens when the bug occurs? Enemy's falling like fly's
What should be happening instead? In my opinion or the Johnson should be more powerfully or give enemy more health

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See the video. I do not want to start a TTK discussion, I just see this more as a bug. 

As well I can use the flame thrower in water.