@DisneyGeek to enter that part of the convo, I think it is far easier to figure out one's stackings by reading up on how the instincts manifest on their own. This is to create you a basic understanding of how they work. Until you get that idea, I wouldn't bother with instinctual stacking variants. Another thing with the instincts is that most people have a poor idea of the social instinct. I "mistyped" (I wouldn't say the error is that great to per se call it a mistype, since my social instinct isn't very developed and I have been confused over this for a long time with good reasons) as /sx/sp for quite a long time because I didn't understand the social instinct. Essentially, the social instinct is the desire to feel like one belongs and be a part of a group, society at large. It creates a sense of inside/outside dynamic where one becomes acutely aware whether one is a part of the group or not. Even counter-social types have this, just that they choose to take stance against the group and purposefully be separate and distinct from it. In both cases though, the object relation to the group remains the same, as opposed to people who are simply oblivious to the group and how they stand in relation to the group. So types want to feel like they belong and they want to feel like the group and the world at large accepts them and they will look out for various cues that create this sense of belonging-ness or conversely, separation.
For example, when I was younger I was very into the metal scene. I suppose one could have called me a scene-ster and I definitely identified myself as a metalhead etc. This need to be a part of the metal scene has waned quite a bit but the point is that I was very aware of what would give me acceptance within the social group of the metal scene. I knew what bands were in and out, how to distinguish "true" from "untrue", how the various subgenres and thus also cultures, saw and interacted with each other and how they were distinct from one another e.g. the heavy metal scene is a lot more about drugs, sex and rock and roll which also carries over to the thrash and death metal scene that is much more acceptable towards "low brow" behavior and even promotes it, as opposed to the black metal scene that is far more elitist and exclusive and takes a counter-culture stance in relation to the rest of the metal scene and then there's the goth scene that's almost more a part of the general goth movement in itself than it is metal and so on and so forth.
The social instinct creates this form of awareness. It also gives awareness of power structures in the sense that you know who is the top dog or who isn't, who is popular and who isn't etc. I know a social 6 who is a lot into political activism in ideology, at least, and is a strong follower of anarchy as a political model. He doesn't trust the establishment and society at large as he finds it largely incompetent and this shows in how counter-social stance of being an adherent of political anarchy. He understands his relationship to the group and society at large and how it operates but actively takes a stance against it.
I need to go now but I'll try to write up how the sp instinct can manifest as well. Essentially, the primary instinct is our core neurosis, the one thing we cannot live without or so we think, so that's where you need to look for it.