Hi doubledragon,
You are confusing yourself by applying so many school of thoughts together. Every school of thoughts has its own theory and you shall not mix them together. 8 Aspirations theory indicate each sector has a particular function like Southeast is for wealth and Southwest is for relationship and so on. However in the ancient text nothing was written on it and this theory was brought out by our modern practitioner for simple illustration
Feng shui is about living in harmony with our living environment and what we are interested is to find out which sector of our house has the good and bad qi. First of all you must look at the external environment and check whether is there any bad effect like poison arrow pointing to your house. A bad sector is not necessary bad if there is no bad external effect and if you can keep the sector quiet.
You must select which school of thoughts that you are comfortable with. For example if you wish to use 8 Mansions then find out the 4 good and bad sectors of the house. Spend more time in the good sectors and face your personal favorable Kua or bazi direction in your endeavors. Good qi will work by itself and what you need to do is to spend more time at that sector to tap the good qi.
It is as simple as that and if you start putting all the theories together then you begin to see your beautiful house looking like a Chinese restaurant or feng shui shop.
Bernard