Enemies ------- Hardener to use ---------- Damage type to use
Amarr---------- EM/Thermal --------------- EM or Thermal
Blood Raider --- EM/Thermal --------------- EM
Sanshas ------- EM/Thermal --------------- EM
Caldari. -------- Kinetic/Thermal ------------ Kinetic or Thermal
Guristas ------- Kinetic/Thermal ------------ Kinetic
Mordus -------- Kinetic/Thermal ------------ Kinetic
Serpentis ------ Thermal/Kinetic ------------ Kinetic
Minmatar. ------ Explosive/Kinetic ----------- Thermal
Angel. --------- Explosive/KInetic ----------- Explosive

Rogue deal all damage types but more Exp/Kin less EM/Therm. Use EM ammo.

Stacking Penalities
1st mod: 100,000% effectiveness
2nd mod: 86,9119842% effectiveness
3rd mod: 57,1037996% effectiveness
4th mod: 28,2469117% effectiveness
5th mod: 10,5988834% effectiveness