In the interval from the epicenter to half the radius of the damage below the indirectHit.
Damage from the explosion, the aim of the same damage from the explosion 1.5-2 meters - this is a problem.
Linear recession damage begins the second half of the radius indirectHitRange - order here.

Sorry for google translate.

Damage at distance:
At now: 0.1m = 1.0m = 2.0m > 4m; Damage at distance more 4m == 0
Needed: 0.1m > 1.0m > 2.0m > 4m; Damage at distance more 4m == 0

Reduced description.

explosionShielding
float≥0
Modifies how global vehicle health is affected by 'splash' damage (indirectHit).
A factor applied to indirectHit damage. Values < 1 make a location resistant to indirectHit damage. Values > 1 make the location more sensitive.
From https://community.bistudio.com/wiki/Config_Properties_Megalist#explosionShielding
The game is tested, everything converges.