For example, a Draconian tank is really just a tank with a turret that has either two really bloody big swarmer missile pods, or with two ballistic missile ports- kinda like a tank firing souped-up Javelin missiles in modern day, or shooting stuff with lots of really explosive peashooters that happen to do a large amount of damage. 

You can probably shoot through them with one hit, but they don't have to have a line of sight- they can just fire, and they go up, and come down on top of you- where shields and armor is likely to be thinnest.

Likewise, I'll probably just have missile cruisers, with only a few heavy ships for front-line use that have heavy armor and probably incorporates the weapons tech of whoever has the best weapons.