Description:
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Survival damage in Fallout 4 is completely wrong. You think in Survival difficulty player receives 2x damage and deals 1.5x damage? Well WRONG! Player receives 4x damage and probably deals 0.75x damage. YES on Survival difficulty player likely does less damage then on normal despite Bethesda claiming otherwise.

I looked in to the files and found 4 values which modify damage:

First two are in the Game Settings:

fDiffMultHPbyPCTSV = 0.5 (difficulty multiplier health points by player character Survival)

fDiffMultHPtoPCTSV = 2 (difficulty multiplier health points to player character Survival)

Another two are Actor Value Information:

HC_OutgoingDamageMult = 1.5 (self explanatory)

HC_IncomingDamageMult = 2 (self explanatory)

All of them seem to multiply damage on Survival. I have test modified fDiffMultHPtoPCTSV and HC_IncomingDamageMult and can 100% confirm that both alter damage on Survival. That means that two others which deal with damage dealt by player very likely do as well -although I did not test it specifically, since it's hard to test. As you can see, 2 x 2 = 4 and 0.5 x 1.5 = 0.75.

To test damage received by player most easily, throw grenade at your feet while wearing no armor. Of course you have to have high enough health to survive it or mod grenade damage.


What this fix does:
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It changes fDiffMultHPbyPCTSV from 0.5 to 1 and fDiffMultHPtoPCTSV from 2 to 1.
No other values are changed.

This should make player receive 2x damage from NPCs and deal 1.5x damage to them.


Compatibility:
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There should be no issues with most other mods, unless they alter values mentioned above.


Installation:
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1. If you didn't already, enable mods for your Fallout4.
2. Copy SurvivalDamageFix.esp in to your Fallout4 Data directory.
-Or use Nexus Mod Manager.