Physics thruster question

hey, I am making a space simulator using physics thrusters for movement, I am trying to make ships that are made of modular components as in can pick parts to build a ship, my problem is that when using a single physics thruster at 0,0,0 (or multiple position balanced) for forward movement the entire ship bluprint needs to be symmetrically balanced with its staic meshes, I have noticed that when I add two different models to a blueprint class , one at left +200 and one at right +200 even if they are both set to mass 0 and don’t simulate physics they will still effect the thruster action differently and cause it will loose stability, my question is, is there a way or a type of mesh that you can add to a blueprint that wont effect the overall balance of the class as a whole or a way to set the center of gravity of a blueprint?