Swarm is viable, but not if you encounter Dengaroo
Swarm CAN manage Dengaroo (a well-built swarm will one-round a Jumpmaster) but you have to survive the approach well enough, which is a tough ask.
I would sa 9 out of 10 encounters you loose, even when Dengar joust you.
1. Encounter: Dengar fires Counter Measures
He shoots 4 ordnance dice with focus token (from Manaroo) which is recharchable due to overclocked mech. So you have 3 defense dice with infinte focus. Usually Howlrunner. Zuckuss lets you reroll your defense dice. Most of the time Howlrunner dies. If not, the revenge shot from Dengar kills her (or the second TIE fighter). Seriously, with Zuckuss TIE fighters explode in one second.
And don't try to hunt down Manaroo, he is fast and Dengar will finish you off. Dengaroo is a counter to so many list (maybe most of the lists), but mostly a counter for TIE swarms