I finally started fixing all the backroutes:
1) Choir of the Mad: All solutions so far have been backroutes (some of them huge ones, some a lot closer to the intended one).
2) Fourtissimo: Backroute by Forestidia (no big surprise)
3) Hope and Despair: Backroute by Forestidia (again no big surprise)
4) Gray Walls: Backroute Forestidia - the old time limit on that level would easily have prevented this one.
5) Moonshine Trio: Backroute by Forestidia - it misses the main idea.
6) Another Generic Title: Backroute by Forestidia - I already got the very same backroute in NeoLemmix, but forgot to fix it here.
7) Minimalistic Platforms: Removed the one backroute by Forestidia, the intended solution is of course kept.