Still should have been included when I said, therefore all the girls routes should have been completed before the defeat of the Russians, so this whole tech update and new characters and locations should have been done before their defeat as well.
1. Tech update done first.
2. Finish the girls routes alongside the main story, but before the Russians' defeat (anything new, of course, added in).
3. Then, immediately after their defeat, have the college prom to finish the story and the game.
This is one reason why I said this game is in the hands of the wrong people: they can't do good planning for a better experience and never want to.