In western Astrology, the 12th Harmonic is important like the 9D along with your numerology chart (your birthday). Harmonic astrology tells you about the people you'll encounter in lifetime. The degrees of Harmonic are important. People who comes to your life will have a personal planet conjunct that harmonic degree.
You are right. Signs and houses are interpreted in an abstract way. The harmonic houses are not active, but the signs are somehow. The signs seems to give clue about the karmic relationship you'll have in these lifetime. They also seem to describe your personality. When a Harmonic planet makes an aspect to a natal planet, it is considered as an actual aspect. I use conjunction and opposition only with tight orb.
In your case, You have 12th harmonic Sun in 27 Capricorn and 10th harmonic (2+8=10) Sun in 09 Gemini. People whose natal Sun is intercepted on the 27 Cap/09 Gemini will share karmic relationship with you. Appleo as an example has his Natal sun 0 Leo opposite your Harmonic sun.
The Aquarius/Leo is strong in your Harmonic charts and you are likely to attract people with strong Aquarius/Leo axis. other strong Harmonic axis:
Capricorn/Cancer,Scorpio/Taurus.
Harmonic Sun conjunct Natal Uranus is aspect seen in natal chart like Nikola Telsa, Rupaul, Robert De niro. This aspects either make a connection to electricity, actors and comedians, drag queen. It is the most frequent aspect in prestigious actors who won Oscars. And Scientists like Telsa and Edison who studied electricity (Uranus rules electricity). Uranus also seems to rule dreams, visions, clairvoyance in harmonics.
Sun/Pluto conjunct Harmonic Saturn is not so good. It is shown in the chart of killers and people who undergo violent temper or tragic life. OJ simpson have this aspect in his chart along other people who had an unfortunate life.
Harmonic Sun/Pluto with Natal Mercury= penetrative mind, investigator.
I think you are rather an accomplished person academically and might be a quite genius. Sun Saggitarius/Moon in Aquarius will get you interested in Philosophy, Science, Human revolution.