I can understand that you expanded the part cause it's an ion Engine,
But the ion engine in not at the center and also you don't need to expand the x orientation it creates no difference by x ,
The increase in power is only by increasing y factor.
And if it's a satellite you don't need that much of power just a normal sized one or two ion are sufficient.
Try to keep all the parts at the center if using panels use two on opposite sides to maintain balance,
I would like if you remake it and also make a rocket to make it orbit.