I've bounced this off one of our Diamond Feng Shui coaches her eat Learning Strategies, Wendy Greer, and she suggested something along these lines:
There are various layers of feng shui. No one in their right mind would use a hexagram in their total loss area to activate their personal energy number. They might, however, use it in that area to activate the general space feng shui, or ameliorate a challenging star or enhance a positive one. You'll need to clarify what you are trying to do with the hexagram and then build that into your intention. You could then use muscle testing to see if using a hexagram was moving the energy in the right direction.
All the best,