That’s a tough one… I mean it’s working as it’s designed, and how it HAS to work, so it’s not like it’s doing anything wrong per se. But I understand your problem.
… I can’t think of an easy workaround for that short of duplicating the FX cahnnels and separating your sends based on how you would want to set up your cue mixes. But that’s an awful lot of work and extra CPU drain, and may end up being just an exercise in futility if you like to change what you put on your cue mixes a lot. I really don’t know. That’s a puzzler. There’s no easy answer to that one.
In a practical sense, the only suggestion I can make is to limit the FX you actually need to send the Cue mixes as much as possible. Only do what you HAVE to do, and that will help dictate the amount of work you need to put in to make a usable cue mix.