What are you doing with these ports? Lateral connections are usually incredibly strong, but horizontal are fairly weak. And are you using the big, medium, or small ports? If you're using small, forget about it. the medium are iffy, but the big ones you should have no trouble with. One final note: is your ship *perfectly* symmetrical? If it isn't, your CoT (Center of Thrust) is not going to be inline with your CoM (Center of Mass), and the connections will break.