Because of Stramm's ability to shed stress tokens 50% of the time after you execute a maneuver, his builds tend to gravitate towards stress-inducing conditions. Cards such as R3-A2 and Tactician are immediately attractive options to maximise his ability.
Kyle Katarn could also be a worthy Crew addition, allowing Braylen a focus token each time a stress token comes off. Gunner adds increased reliability in the combat phase.
The red maneuvers of the ARC-170 are put into a slightly more powerful realm when Stramm is piloting;, however, be mindful he can only shed one stress token with his ability.
Of course, the must-have for any ARC-170 is Alliance Overhaul.