Stingray -- Sorry I can't tell you anything about astrology and past lives.

However, I can tell you there's a book titled "A Spiritual Approach to Astrology" by Myrna Lofthus that uses a past-life karmic approach to analyzing planets and aspects. For instance, she says that the moon is "the sum total of all the personalities one has been from previous incarnations." Her summaries of various aspects have a past-life cast to them. For example, venus trine jupiter begins with, "In other lifetimes, these individuals have begun the work of attuning themselves to their higher self. ...." You get the idea -- the whole work is about astrology and reincarnation.

I can't vouch for this author because I don't know enough about the subject matter. But it sounds like something that might interest you.