I have
similar spec to yours, and had the same problem with Kiel, Wilhelmshaven, etc...
MY OLD CTD MOD SOUP
My educated guess is that it might had something to do with sea state changing from "calmer, harbor" to "normal, open sea". Like you, I had the crash at the exactly same radius from the port every single time, be that entering or exiting.
Try moving the environment mod at the end of the list, that did the trick for me.