Onto @brainheart 's OP and the topic at hand. This is a great question and one that I'm not sure I have totally figured out yet. I've actually wondered more than a dozen times in the past couple of months if I might actually be Sx/So instead of Sx/Sp. I mention that because I do feel the social shame attributed to the social 4, just not all of the time. I find it so hard to tell as a 4 about Sp because I'm an introvert who considers every aesthetic element of my living space. Some would call that Sp-ish, but I'm beginning to realize it's not, it's just 4-ish. Besides, I am not overly welfare concerned as far as things like: locked doors, things being stolen, finances, my physical health or comfort, etc.
As far as envy goes, I unfortunately can relate to Naranjo's descriptions of Sx 4. He describes the envy of an Sx 4 as almost cannibalistic, "I envy you, so I kill you." is the way I believe he put it, very much in Cain style. Yep, not so pretty but there it is. I've grown a lot in this area, and though I still sometimes want to jack people in the face (mostly only when my envy of them is tied to feeling plagiarized or copied), I've become very capable in the self control department.
I do agree with the aforementioned concept of envying the abilities, friendships, circumstances of others as apposed to envying them as individuals-- that doesn't really happen because I frankly like being myself.