I have had exactly the same experience, including staying at the minimal dosage. I have been on autopilot at goal weight with tirz and survo since October. Everything clicked when I kept tirz at 7.5 and raised survo from 1.2 to 1.8. Food suddenly felt completely different, like coming out of clouds into clear sky. It has stayed that way. It is definitely a trip. Congrats!
My preferences shifted abruptly and intensely. I still want girl scout cookies and creme brulee, and when eating out I still want pizza with feta, kalamata olives, and roasted tomatoes. At home though I now reach for salted cucumbers on bread or a tortilla with thin avocado slices, rice, and cabbage, maybe some baba ghanouj. No meat or cheese, but tofu is fine. I am not forcing anything or worried about the last nine pounds. It is just strange to think of cucumbers as a comfort dinner. I really enjoyed a tofu rice bowl the other day. I have not raised my tirz dose, I am not depressed, and nothing obvious explains it.