If you've got a Dunov hanging around with EMP Bomb, use it on the largest cluster of Overseers/Subverters you can find. It'll deplete antimatter and shields from all ships within its area of effect.
As always with TEC, their primary strength is the survivability of their ships once Hoshikos enter the picture, as well as armor upgrades (up to +6 armor for every single ship).
On top of what HolyLime said, as TEC, you should be able to produce replacement ships more easily than a Vasari opponent in terms of build time (especially if you have Industrial Juggernaut researched) and cost. The point where this advantage is mitigated is when the Vasari player gets RA up and running and/or when Enforced Labour (credit cost of ships -8%) and Optimized Construction (resource cost of ships -8%) are researched.