Types to Fire on Enemies:
☢
Angel - Explosive/Kinet
Blood - EM / Thermal
Drones - EM
Gurista & EoM - Kinetic
Mercenaries - Thermal
Mordus & Serpentis - Thermal / Kinetic
Sansha - EM / Thermal

Damage Types Dealt by NPCs:

Guristas : 81% Kin - 19% Therm
EoM : 66% Kin - 34% Therm
Angel : 56% Explo - 28% Kin - 10% Therm - 6% EM
Sansha : 60% EM - 40% Therm
Blood : 53% EM - 47% therm
Drones : 50% Explo - 18% Kin - 16% Therm - 16% EM
Serpentis : 62% Therm - 38% Kin
Mordu's : 70% Therm - 30% Kin
Caldari : 51% Kin - 45% Therm - 4% EM
Gallente : 58% Kin - 37% Therm - 4% EM -

Sanshas+Blood: tracking disrupt
Blood: neut
Guristas: jamming
Angel: paint
Serpentis: damping
100.0% / 86.9% / 57.1% / 28.3% / 10.6% / 3.0% = Stacking Penalties
0.5: Roughly 19 seconds
0.6: Roughly 14 seconds
0.7 : Roughly 10 seconds
0.8 : Roughly 7 seconds
0.9 and 1.0: Roughly 6 seconds
http://games.chruker.dk/eve_online/npc_corporation.php?cor