Moongold,
I'm a bit puzzled by you associating the eighth house with groups, since I've always seen that ascribed to the 11th house, with eighth house being linked to long-term relationships, other people's money, the occult and other hidden stuff, sex and death.
My own experience of Saturn is that he is very much the reflection of my fears. I have Saturn in Scorpio in the second house, and I do get very neurotic about security, pensions, and 2nd house stuff like that. My Saturn is the planet who says "No". Sometimes, that stops me doing what I want, but sometimes it also saves me from getting into trouble. Saturn is also about discipline. At the moment he is going spare because I'm writing this posting rather than getting on with my book index: "You need to do your index. If you don't meet the deadline, not only will you risk losing the money for this job, you might never get any more work from that publisher" etc etc.
With respect to semisquares, I must admit that I don't tend to look at them very much, and see them as a stressed, but minor aspect. I agree that Saturn opposing Sun can be seen as heavy, because this makes Saturn say No to the Sun, ie to the basic essence of being.
I have Sun conjunct Venus in Aquarius in fifth house, trine Moon in Gemini (9th) and Neptune in Libra (1st). I am fairly typical Aquarian, interested in social progress and ideals. Uranus in my 10th house (Cancer) initially expressed himself in my scientific training, which again is harmonius with Aquarius, but now it is Uranus the esoteric magician who has started to come through, reinforced by the Neptune (spirituality) trine to my Sun. Mercury in Pisces is rather pleased when I set aside the rigidity and precision of typical scientific communication for the stuff of dreams, visions and pathworking. Aquarian Sun/Venus in fifth is less expressed in creativity than in the fact that I do not feel myself bound by conventional ideas and legal ties with respect to relationships. However, Sun/Venus are opposed by Pluto in Leo (10th), who forces me to face my truth in all my actions, and also demands intensity of both these planets. Thus, I have not flitted from one relationship to another, as might otherwise be expected; the few relationships I have experienced have all been either transformative or highly toxic.
Apart from the Sun/Venus-Neptune-Pluto-Moon kite as described above, I have a yod with Pluto sextile moon both inconjunct Chiron in the 4th house. The question of roots, or rather, an ability to connect at all with my Polish roots has played a fairly major role in my life.
Incidentally, I came to astrology through astrodrama, where a group enacts the planets in one individual's chart, with respect to an issue or question identified by that individual. It is partly as a result of my experiences in such work that I tend to focus only on major aspects when I do charts. Also because of astrodrama, I do put quite a bit of emphasis on Chiron, because it is amazing how often he becomes the key to the understanding and resolution of an issue.
krys