Everything I've read, and some I've seen firsthand, the TIE Swarm is not faring as well as it could. Something I've thought about is this custom title (and corresponding Condition)
Imperial Swarm Doctrine
Imperial and TIE only; Title
At the start of combat, choose an enemy that two of your ships with this title have in arc. You may assign that enemy the • There’s.. too many of them! Condition.
•There’s.. too many of them!
For every enemy with the overwhelming Swarm title that has you in arc, reduce your agility by 1 (to a minimum of zero)
The reason I did this as a title is I do want it to work well with both Swarm Leader and Swamr Tactics. Plus, anyship that already has a title will probably want to equip that ships specific title instead.