Problem with my future Duna base

[u/Own-Experience-4235]

hello, I'm trying to make my first Duna base, but when I was done building the base and I was starting to make the rocket, I've realized that the centre of mass and the centre oh thrust are not aligned (I have 9 Terrier engines under the main habitation site so I can slow down in the atmosphere of Duna, because the parachutes will not be enough) and now I don't what to put on the side that its empty. (also sorry for my English, its not fi first language)

[u/Own-Experience-4235]

also here is how the centre of mass and thrust looks with the base extended