Hello,
I think star bases could use a tweak. I think they need especially a way to also gain additional hit points during the game.
I think a star base should at least be able to defeat a decent fleet on it's own and not just be sitting duck.
This could for example be realized, if each added module provides +X hit points or with each hull technology there could be a new module that adds hit points to the star base.
Just my thoughts.