I like these ideas:

If an attack with a torpedo hits, the first card dealt is dealt face-up.

When attacking with a missile, the defenders agility is reduced by 1 to a minimum of 0.

Its thematic, as missiles are a bit easier to hit fighters with and torpedoes are generally a bit more powerful. But the easiest is the TL being kept instead of spend.

I dont know if someone has mentioned this before, but IMO easiest fix would be to make a correction in main rules that defender rolls one less agility dice against ordnance attacks. That would benefit all ordnance, including homing missiles. Re-roll fixes don't help homing missiles so much. That would be thematically ok too - locked missiles/torpedos aren't so easily evaded.

Ordnance would be best attack choice, when defender is in range 3. Even better than canons and that is thematically ok too, ordnance should be better than other attacks in long range. Wedge/Outmanouver elite with ordnance would be 2 less agility dice for defender. Tie Defender/Advanced/Z-95 (N'dru anyone?) with cluster missiles probably with outmanouver/predator would be a nice threat too. How about GS A-wing flanker with both predator + outmanouver abilitys? Still ordnance would be "one use only", so I think it wouldn't be too powerful.

No need to change pointcost of cards this way, and if someone still thinks ordnance isn't powerfull enough - lets add Predator/howlrunner ability to reroll one dice in ordnance attacks, but IMO that would make them too powerfull.

I like this idea alot. It's simple and to the point. So your really saying ignore the range 3 and subtract 1 agility, and for range 1-2 subtract 1 agility.

My idea that our group uses: Is When you have secondary weapons that require you to break a target lock, you do not remove the Target Lock until the end of turn and you may use that target lock in the attack.

This helps all around at all ranges

Yep, thats what I suggested. -1 agility against all ordnance in all ranges where that ordnance can be shot at.

There is one proplem with "you can keep the target lock" fix, namely Homing missiles. Our only missile in current rules that lets you keep the target lock. They would need a big point cost fix, if rules are changed so that one can keep target lock with all ordnance.

Give all ordnance splash damage.