I've noticed that after a peace the tensions between the countries previously at war goes down. In my case I was playing Germany. I defeated the British and after the peace treaty my tension with them seems to decreasing every turn. To me, this makes sense as it represents a peace treaty. So far so good. Now let's come to the part that is probably not working as intended.
I've also noticed that my tensions with France are decreasing when I send task forces to the Channel or the North Atlantic. When I send them home, there is no change in tensions. So, I think the modifiert that decreases tensions is erroneously applied to your relations with all nations instead of just with those you signed a peace treaty with. I'm going to continue the campaign to see if this is temporary or not.
I've also noticed that the center of gravity calculation seems to be off, at least for this torpedo boat I was trying to build. According to the weight list, most of the mass is in the rear half of the ship. The forward gun is the only component forward of the ship's center with a significant lever arm. Despite this the ship still has a massive for weight offset.