Quick thoughts
1. I agree it is perhaps cleaner to leave out Drone transport for the moment, though personally I have less of a problem allowing a bomber to be able to transport them (Rhinos, Chimeras, Wave Serpents all do the same thing), and I quite like the option of choosing to carry Drones instead of some weaponry.
2. On ML, I can go either way. As Hena says, getting another formation to ML the target is more realistic and preferable IMO, but the way self ML will limit missiles to 30cms is also cool.
3. On the Ion cannon (and indeed all weapons that are Fixed Forward) I would prefer to drop the AA stat because it is meaningless. As the TS is a bomber it cannot be used offensively, and having a fixed arc of fire means that any CAP will be placed to avoid it. AP4/AT5 seems reasonable stats, so multiples can be used, but these are the same as the missile pods, so the entry will then become somewhat cosmetic.
4. Weapon ranges. I would really like to suggest having different ranges for the A/c, so weapon "A" at 45cm, weapon "B" at 30cms Weapons "C" & "D" at 15cms; forcing the player to make choices on how close to roam.
5. On Costs.
Barracuda is spot on IMO. A bit better than the Thunderbolts for 25 points more
However, I am much less sure about buying a third as it makes the formation a whole lot better.
Tigershark costs need to be greater than 250 to prevent the "4 pairs" abuse. We are going to make both formations 'punchy' and they should have appropriate costs. That said at 275 for example, two TC and two Barracuda formations for 900 points seems a good deal (and leaves room for the more expensive AX-1-0 as well).
AX-1-0 is much harder to cost. Even if made weaker to be unattractive, the addition of 'generalist' weaponry will tend to make this a favourite, so I guess we may need to use the unpalatable 0-1, or 1 per 3000 solution.
6. On the TK Railgun, if limited to TK (D3) we are going to need something else to give it the desired 'punch' as an average of ~2.3 TK hits won't cut it IMO. Heck you are only going to kill a single unshielded Warhound around 50% of the time. Bigger titans will need multiple passes. But perhaps we need to 'suck it and see'.
So my preferred stats look much like other peoples.
TigerShark Strike craft    (2 for 275)
Armour 4+, Bomber
Seeker Missile      45cm  AT5+       Guided missile, Fixed Forwards Arc
Twin Ion Cannons   30cm  AP4+/AT5+  Fixed Forwards Arc
Missile Pod        15cm  AP3+/AT5+  Fixed Forward Arc
Burst Cannons     15cm  AP4+/AA6+
TigerShark AX-1-0       (2 for 325)??
Armour 4+, Bomber
2x Seeker Missile    45cm  AT5+         Guided missile, Fixed Forwards Arc
Twin Railguns      30cm  MW3+ TK(D3)  Fixed Forwards Arc
Burst Cannons     15cm  AP4+/AA6+
StatsTigerShark Strike craftAP ~3.3 hits from 6 weapons
AT ~2.0 hits from 6 weapons
TigerShark AX-1-0 AP ~1.0 hits from 2 weapons
AT ~2.6 hits from 6 weapons (of which ~1.3 hits are ML)
TK ~4.0 hits from 6 weapons (of which ~1.3 are ML and ~2.6 are TK)