My Mamba is fitted only to damage the heat core and is always on silent running near the Titan. Always producing more heatsinks.
The Thargoids generally don't see me but I churn through heatsinks the whole time because my ship isnt engineered so it can cool itself off sufficently enough using lasers.
When heat core comes out I throw every AX Missile I have on it.
Most of the time Thargoids don't bother me while I do this. Eventually one notices me and starts to fight at which point I fly a bit away from the titan to get them off my tail.
Repeat until I've had enough or got shot down by one too many Thargoids that I came too close to.