There are just a few hints on these 2 extra pillars. Not much is written about it used. Does Manpai find it usefull?
I don't think they do. Street blind practitioners use them apparently, but that is very different style(as they use a lot of Na Yin, Shen Sha and other stuff).
I don't use them a lot too.
And the Soul...
Relation to our Soul is complicated(for most of humanity, anyway). As the connection to it is very different depending on our understanding and the way we function here(electromagnetic flow in our bodies etc.)
For example we can look at the experience that could be gathered while living/experiencing on Earth as represented by 6 steps, what in the esoteric schools is viewed as Initiation.
Each initiation is changing completely how the flow in our bodies will move... That changes everything, from the way we view existence and Source/God/Way etc. to how our chakras function.
The Soul for example initially we can connect as a point in our Prana Channel above our head(around 20cm for most people). However, as someone takes 3th initiation(something that through the changes last few decades humanity have taken collectively, but haven't integrated yet), the Heart and Throat chakra merge forming a very big center called "Cosmic Heart" in upper part of our chest.
At 3th initiation when that "space" is created, the Soul comes down merging with the Cosmic Heart and anchoring strongly into the Thymus Gland. At that point on any rules we will use for it will change, as the light in us functions in a different way.
So my idea is that humanity relation to its Soul(collective and individual) is a lot more complicated then it may seem and I'm not sure we can follow all that from any astrological or similar system, as they are catching the moment the Soul becomes represented here... Above is more subtle and difficult to fully get without using very different terminology and a lot different ways for gathering knowledge(much more related to meditation and inner path). Both have their place of course, just not fully flowing into each other yet. Someday, hopefully...
I'm not sure this is for here... But this is about the Soul and how it functions, and this is what the question was about... So why not...