Damage from the explosion increased because of the multiplication.
explosionShielding > 1 make the location more sensitive.
https://community.bistudio.com/wiki/Config_Properties_Megalist#explosionShielding
cfgVehicles:
class HitChest : HitDiaphragm {
armor = 1; material = -1; name = "spine3"; passThrough = 0.1; radius = 0.15; explosionShielding = 6; // ×6 is ERROR visual = "injury_body"; minimalHit = 0.01;
}; {F27348}