As you’ve probably read a certain number of times, only providing the file can help when about condensing issues, because it is so… delicate. I understand where you are, but still, I think it can help to understand deeply how Dorico does the choices it does when condensing. If bassoon lines were really a copy of the flutes lines (downed by 2 octaves probably) the result should indeed be the same automatically. What matters here is :
• Are the lines really identical in every way (dynamics, accents, rests) ?
• Do the musical sentences start and end at the exact same place ? (That’s when simply putting a condensing change is really effective, to make Dorico think this is a new start)
I am very sorry to read that your publisher now wants the other way round. That’s the kind of case where it’s probably better to have as many automated things as possible, in order to simply change the options…
Let us know if you’ve found some pattern that caused you problems and if you found a nice way to work this through!