...I don't even consider predictabiity, in my astrology theory. I just think of probable characteristics a person would have, based on time of birth ,place of birth, geneology, and all contributing environmental factors.
...As for which system to put most faith in, I read the basics of all the major religions and several philosophic doctrines, and found that they all contain a like thread of truth. After this I meditated, and contemplated, and then formed my own personal code of ethics, and philosophy.
...Hearing a learned person like yourself, tell me that you and great minds that are actually published(!) agree with my self derived beliefs, makes me wonder where my head would be, if I wern't a high school dropout.