Thank you, that is quite helpful. I really appreciate it.
I found an interesting reference to 18 armed goddess 9+9=18 of course, the significance is in the description and reinforcement of her power, even though she is discussed outside of normal Vedic literature:
"She is consciousness (Cidrupa), She is the abode of knowledge (J˝ana) and is Consciousness and Bliss, lustrous as ten million lightnings, of whom all Tattvas are the embodiment, who is Raudri with eighteen arms, fond of wine and mountains of flesh (the text is Shivamangsacalapriyam, but the first word should be Sura). Man should do Japa of the Mantra, taking refuge with Her, and following the Kula path. Who in the three worlds knows a path higher than this? By the grace gained therein, the great Brahma Himself became the Creator, and Vishnu, whose substance is Sattva-guna, the object of adoration of all, highly deserving of worship, the great, and Lord of Yajurveda, became able to protect. By it Hara the Lord of Viras, the wrathful one, Lord of wrath and of mighty power, became the Destroyer of all. By the grace of Virabhava the Dikpalas (Protectors of the quarters) became like unto Rudra. By a month's practice power to attract (Akarshanasiddhi) is attained."
- The Rudrayamala