Damage type to Deal / Protect against:
Angel - Explosive / Explosive 62%, Kinetic 22%, Thermal 9%, & EM 7%
Blood Raiders - EM or Thermal / EM 50%, Thermal 48%, & Kinetic 2%
Guristas - Kinetic / Kinetic 79% & Thermal 21%
Khanid - EM or Thermal / Thermal, EM
Mercenary - Kinetic, Thermal, Explosive, & EM
Mordus - Kinetic-Thermal / Kinetic 70% & Thermal 30%
Rogue Drones - EM / Thermal 42%, Kinetic 32%, EM 22%, & Explosive 4%
Sansha - EM-Thermal / EM 53% & Thermal 47%
Serpentis - Kinetic-Thermal / Thermal 55% & Kinetic 45%
Gallente - Kinetic-Thermal / Thermal-Kinetic

Stacking penalty mod for Nth module or rig = 0.5 ^ [ ((N-1) / 2.22292081)^2 ]
1 : 1.0000000000
2 : 0.8691199806
3 : 0.5705831430
4 : 0.2829551534
5 : 0.10599264
note: modules with highest bonuses are calculated first.

High End Guns: *=Best
Rail guns: Compressed, Prototype*
Blasters: Anode, Modal*
Lasars: Anode, Modualted*
Artillery: Prototype, Scout*
Launchers: OE-5200, Arbale