I've had a lot of success with sear swarms with TA-175 I just can't decide which version is better :

Captain Sear (39)
TA-175 (5)

Techno Union Bomber (26)
DRK-1 Probe Droids (5)
Landing Struts (1)

Trade Federation Drone (19)
Discord Missiles (4)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Total: 200

Or

Captain Sear (39)
TA-175 (5)

Trade Federation Drone (19)
Discord Missiles (4)
Grappling Struts (1)

Trade Federation Drone (19)
Discord Missiles (4)
Grappling Struts (1)

Trade Federation Drone (19)
Discord Missiles (4)
Grappling Struts (1)

Haor Chall Prototype (21)
Grappling Struts (1)

Haor Chall Prototype (21)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Trade Federation Drone (19)
Grappling Struts (1)

Total: 200

The advantages of the hyena is the extra 2 hit points and DRK-1 probes that give the whole swarm a lock for the first round of combat but after that the probes are mostly useless unless the swarm is out of combat for a while

The advantage of the extra buzz droids is the amazing effectiveness of them, most big ships can't shake them and most small ships can't afford to take the crits (killing vader with buzz droids was very satisfying), however they strip 3 of the valtures of calculate tokens, most likely during the first round of combat.

I'm not sure which to use, any sergestions for which and improvements?

This one just made 2nd place at a 60 person tourney in Sacramento!

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Captain Sear + TA-175 + Impervium Plating + Soulless One
Trade Federation Drone + Discord Missiles
Trade Federation Drone + Discord Missiles
Trade Federation Drone + Discord Missiles
Trade Federation Drone
Trade Federation Drone
Trade Federation Drone
Trade Federation Drone

In my playtesting I'm finding it hard to get value out of Sear's ability. Is there a way you guys are flying to line up more bullseye arcs? Almost seems to me like saving points with a Feethan Autopilot (which also provides another calculate token to the shared pool) or upgrading to Wat is more beneficial.

Sear may not activate too frequently but if you keep the valtures in a wider line, two rows of 4, I sergest setting up in one corner with sear in the back line and in the corner placing obstacles at the rough place you believe you will need to turn around, with this formation you are likely to get at least 1 from each row with a ballseye, you may not get many uses in a game against aces but they must then work harder to escape the valtures ballseye, hopefully forceing them to lose shots.

The problem with down grading is that it loses the focus, both for offence and defence, however the latter is more important as loosing the tactical relay is bad for the whole list.

I like Wat but he only benefits himself not the hole sawrm, and his ability gels better with kraken.