Awesome. I did also run into another problem. Since I saw you mentioned there is no harem option, I decided to go with a solo Jamie playthrough, since she's my favorite LI. The problem is that when I got to the bar scene with the coeds, I didn't have enough total trust points to avoid the "strictly business" route. So, in trying to be monogamous with Jamie, I ended up losing her and everyone else.
I'm sure that I turned down some free trust points with the other girls, that I could have taken without opening their routes, but it felt wrong to me that I take those points if I want Rockford to be solely interested in Jamie. It's also very hard to know which trust points you can take without locking in a girl's route, or triggering a scene you don't want. It seems to me that you should be able to focus completely on a single LI, and not be kicked from their route just because you didn't try to get closer to other LIs.
Not sure if this issue only applies to Jamie's route, but maybe instead of only a total trust check at the bar scene, also checking if the player is on a monogamous route, and checking that LI's specific points might help. It just feels like I got punished for trying not to play Rockford as an asshole, or indecisive. Since the game won't have a harem option, it seems like punishing the players for picking one girl and sticking to her is a bit harsh.