Hi Shane,
It's easy....but undocumented.
If you have three virtual instruments in a patch and you want to reorder them do this: Select the fader you want to appear first in your order and press (Command D) -it's in the edit menu under duplicate. Now you have two faders of that instrument. Continue doing this with the other instrument faders in the order you desire. When the mixer has three instruments channel strips with the correct order, delete the out of order duplicates. Your keyboard layers will change order visually as well.
It's a good idea to re-listen to these reordered layers before you go buck wild with your whole set, to make certain the patch still sounds and behaves as expected......
All Good
bb