Sounds boring. Honestly, my least favorite thing in games is when I get a 'story target' to 1 hp and hten can't kill him until his scripted stun locks me up and he escapes, or kills me, or does whatever the story demands. Boring. And let's please not use CGs, they ruined Jaque's, please don't ruin Thargoids with them.
Who says it would hang at 1hp? What if none of your weapons can deplete its shields? Or scratch its armour? What if it enters self-repair dormancy at 50% hull, repairing faster than even multiple wings could damage it but giving you a window of opportunity to escape? Any of those would be perfectly within lore. You're confusing badly-implemented cut-scene triggers with fearsome opposition.