Your knowledge in Astrology is all what you hear from fake astrologers. Read my blog navagrahastro.blogspot.in. Caste system is man made and it has no meaning like one caste is better than the other. Division of job is what led to the caste system. Some Brahmins are worse than Sudras and there are very good human beings even in Shudras. Read my articles on the blog and you will be well enlightened in Astrology and its scope in life.