an interesting question. You should ask the factory. they have done extensive stability is the model calculations 37 in 06/07.
and the picture you will see an indicative result for people and load all the tanks full. the ship's stability should last wave height of 13 feet with waves of 26 feet. The owner's guidelines do not specifically listed where people and cargo. The old boat was a fly bridge CE-B 8 people and guidance for max 5 people fly so that stability is the height of the wave condition in a situation where the current 13 feet.
It would be great if you could be in contact with them and ask this and to share in this chain response. I have asked all the stability of the documents, but they did not give, I think from them to give something tangible to your question.
Nordic tug guys
Nordic Tugs Stability & Buoyancy Evaluation: NT little article from the factory and see a photo in which a change is to be tilted to 37 more that the water flows into the engine room air channel, slightly raise the demister, This change is made at least in all European export models from 07-, maybe even US? ...