1) It would be interesting if ships were more rare, especially the larger ships. Destroyers on up. Capturing / salvaging ships would be more important. The concept is that these are very expensive items and not easy to manufacture. Few worlds have the manufacturing base to even build frigates.
Currently ships feel too throw away. Ship with too many dmods, salvage them, you don't care, buy another. Battles are too numerous. Too many large fleets flying around.
2) A second idea is to have too much flux simply cause more malfunctions and slow your rate of fire. The sudden buzzt and I can't do anything now is a little silly. A huge hulking battleship, lets design it so that if you use the weapons too much it will all shut down.
3) EMP effects are too strong. They should at most take out a few weapons for a short period of time. Completely overloading an enemy ship is too easy. My using it while the AI does not makes for un-fun battles.
4) Weapons should not repair so quickly. Armor is gone in an area and a weapon there gets hit. You are only getting it repaired after spending a day or two on it after the battle. Aiming for more of a slugging it out feel to the combat.
If this same idea applied to engines? Getting shots into someones rear becomes key. More tactical battles?
5) Major damage to a ship should require repairs at a base or the availability of a specialized repair ship in your fleet.
6) Surviving crew on destroyed ships should be much more numerous. Why? Well if a ship is salvageable, it implies that its not destroyed that much. They are in space suits. The ships do have armor.
7) You should be able to employ medical techs in your fleet to salvage organs from the deceased on both sides. They do sell for a lot on the market.