Vicki, although you've confused the issue somewhat by bringing in sidereal degrees, your main question is one that should concern all astrologers. Dropping the terms that cause confusion (precessed and non-precessed), the question is whether the symbolism of a degree remains constant through the centuries in the tropical zodiac.

You have given some examples in an attempt to show that symbolism does indeed remain constant in the tropical zodiac. The same question can be asked of anyone who uses a sidereal zodiac in their work. Is the symbolism of a single degree constant? (If not, then the symbolism is attached to the tropical zodiac.)

What is the origin of the "accursed degree" of 19 Scorpio? Did the mythology of this degree originate simply because it's the degree that is inconjunct (quincunx) the Sun's exaltation in 19 Aries?

Are there genuine exaltation degrees for the planets?? Can anyone supply evidence for this an any zodiac? Can three degrees of Taurus be demonstrated as the exaltation degree of the Moon, for example? Logic decrees that the exaltation degrees of planets (if they exist) can't operate in all zodiacs at the same time, including the tropical zodiac or more than one sidereal zodiac.

So while astrologers continue to add new celestial bodies and techniques in their work such as asteroids, midpoints and small "planets," very basic questions still remain unanswered. And this is why for now astrology can't be considered a science as the world understands the term. From the outside astrology appears to be a fantastic mix of diverse opinions, techniques and practices with little proof for anything at all.