So what kinda of gear do you need to lower the dmg to your ship? List below maybe helpful.

Faction - Damage type they do.
Angel (gist)- mainly kin /exp (rarely-thm)
Amarr Navy (divine)- EM/Thermal
Blood Raiders(elder,apostle,corp--,etc)- EM/Thermal
Caldary navy - Kinetic/Thermal
Gallente - Kinetic/Thermal
Gurista (pith)- Kinetic/Themal
Khanid - EM/Thermal
Mercenary - EM/Thermal/ (Kinetic-missiles) merc elite- exp
Minmatar Fleet - Thermal / Explosive
mordus Legion - Thermal / Kinetic
Rogue Pirate - EM/Explosive/Kinetic
Sansha - EM/Thermal
Serpentis (core,coreli, eom)- Kinetic/Thermal
Thukker Tribe - Thermal / Explosive
Zazzmatazz - all types of dmg
Stacking penalty mod for Nth module or rig:
0.5 ^ [ ((N-1) / 2.22292081)^2 ]
1 : 1.0000000000
2 : 0.8691199806
3 : 0.5705831430
Jammers
Caldari - Gravimetric = Spatial Destabilizer - Blue
Amarr - Radar = White Noise - Yellow
Gallente - Magnetometric = Ion Field