The center of gravity on that ship looks like it could only be improved by chucking containers overboard. On the other hand, chucking them over the side one by one might be harder than just pushing a whole column over but making that kind of sudden weight change might not be good.

I wonder what the options even are for removing the containers? I assume they're very securely strapped on most of the time, and maybe there's not any reasonable way to get any of the containers loose outside of a port without making the whole pile unstable.