Dear Mr. Kojuharov,
Thank you for your interesting post and graph. The graph does resemble Kellerstom's on the zodiac ancient astrologers were using. Your graph clearly shows the Fagan-Bradley and Lahiri (Spica) patterns.
I've computed (Solar Fire 5.1) some of the Babylonian horoscopes found in Rochberg's BABYLONIAN HOROSCOPES, and found that in general the figures were closer to the Lahiri/Krishnamurti values. The Fagan/Bradley ayanamsa places Spica at 29 Virgo while the Lahiri ayanamsa has Spica at 30 Virgo. For those interested, there is a short article and comparison table here: http://users.snowcrest.net/sunrise/arochberg.htm
I am most happy that you have computed the charts in GREEK HOROSCOPES and graphed the results. There seems little doubt that astrologers were working in the sidereal zodiac, though they may not have been aware of what they were doing.