For any hints to give I would definitely tell you to revisit Alex's and Murasaki's demands, as I found that a lot of people tend to forget them. Also, a friend of mine misread Mako's and thought that she didn't want to go with Murasaki, when that wasn't the case, so watch out for that as well
The main purpose of the sorting is to make everyone happy. There is only one correct combination, and don't forget about Lare
For future playthroughs, I recommend asking questions in the tutorial in a different order ;] you might find some interesting info. Also, check up on different people during free time, those choices will add up and change future dialogue! Thank you so much for the kind words <3