Suggestions for additional module, if I may be so bold:
Armor effective module, it should have a drawback like jump cooldown, maneuverability, acceleration, top speed, or a combination.
A Jump calculation time reduction, low percent boost highish power draw.
Shield tradeoff modules, less capacity faster recharge and more capacity but much slower recharge.
Crew effectiveness modules, either flat or percentage based (Flat could be like "robotic crew unit), most likely cost balance would be power consumption.
If the game ever allows for it:
weapon/damage type shield/armor hardening.
"Set bonus" modules.
Fleet boosting modules.