dominicosoba, would you be interested in trying out a new build of the game with a potential fix? I've added a new "very easy" difficulty setting (that unlocks once you've completed the four standard routes on any difficulty) which significantly lowers the requirement for the secret route: It now relies only on the visible friendship bars, many of the hidden checks are gone, and you have a bit more leeway with Tom.
I totally understand if you don't want to be a guinea pig, and just want to wait until someone else tests it and/or a walkthrough exists. But if you're interested, send me an email at bobcgames(at)gmail ?