Some new idea:
In my battle, it seems that AMM and fleet defence turret is a bit OP against ASM. Even with tech advantage, the only way to surely hit enemy ship is to spam and overwhelm the whole defence, especially when they have 200-300 ships in a single task group. Also, my AMM have >100% hit chance against enemy ASM, so I only have to use AMM as defence, and the only real threat is enemy AMM spam, which is very annoying and time consuming.
My idea is that AMM should have lower hit chance against missile, turret should have higher hit chance to protect themselves but lower hit chance to protect other ship, especially when there are hundreds of ships in one group. To counter spam tactic, my idea is to rebuild ECM system, ECM could be much larger and have an effective range to jam X% of all incoming missile which don't have sensor and ECCM support, only the strongest ECM device in fleet is effective. Missile with sensor would continue going but not guided, until their own sensors could pick up target.
Idea of long range ballistic weapon(railgun, cannon or partical beams?): medium range(~20m), sublight speed, finite ammo, low hit chance and track speed, can be picked up by sensor but can't be intercept or jammed.
Also, NPR and spoiler ship and missile design could be improved, especially when they begin using fighters. May you collect some impressive ship ,fighter and missile designs in forum? I wish to see some really challenging spoiler invades, like how shivans did in Freespace2.