I am sending a 12 track drum set is auxiliary track (in cubase, it is called FX track) for the parallel comp purpose. I find the panning does not effects on the sends, no matter it is pre-fader send or post-fader send.
In the parallel comp method, for the audios feed in to the Comp Bus, the balance is not the same as the Drum Dry Bus, and panning is the same as the Drum Dry Bus.
Have you notice it?