Damage type to protect against:
Angel - Explosive (72%) / Kinetic (17%) / EM (11%)
Amarr Navy - Thermal (53%) / EM (47%)
Blood - EM (49%) / Thermal (46%) / Kinetic (5%)
Caldari Navy - Kinetic (54%) / Thermal (46%)
EoM - Kinetic (74%) / Thermal (26%)
Gallente - Kinetic (58%) / Thermal (40%) / EM (1%)
Guristas - Kinetic (86%) / Thermal (14%)
Khanid - EM Thermal
Mercenary - Thermal (50%) / Kinetic (34%) / Explosive (9%) / EM (7%)
Minmatar - Explosive (48%) / Kinetic (24% / EM (18%) / Thermal (9%)
Sansha - EM (55%) / Thermal (45%)
Serpentis - Thermal (55%) / Kinetic (45%)
Drones - Explosive (68%) / Kinetic (20%) / EM (6%) / Thermal (6%)

Main Damage type to shoot at the enemy:
Guristas - Kinetic
Serpentis - Thermal
Mordus - Thermal / Kinetic
Blood - Thermal
Sansha - EM
Angel - Explosive
Mercenary - Thermal
Drones - EM
Stacking Penalty
1st mod: 100% Effectiveness
2nd mod: 86.9