Andresson was on the equivalent of US$3,000 pcm, when the median Estonian wage as of the time was just US$178, if a job could be found at all. He attended the Tallinn naval school and then the prestigious Leningrad one. To become captain, i.e., to get his licence, he had to become a member of the Communist Party, although he had never been a member before. Having an Estonian crew was the pride and joy of Estline, as normally they would be Swedish. Thus, I doubt Andresson stepped out of line as you claim. Yes, he had performance targets, i.e., including punctuality and getting the ship out on time and arriving as scheduled but this is a normal part of any captain's duty.
I am not sure Estline and Nordstrom & Thulin, the joint owners also owned the Port of Stockholm, as claimed, as Europa and Mariella were owned by Silja Lines and Viking Lines, and they also had a regular bay.