Okay let's drop the use of Ji and Pe, because you are using it in such a way that indicates to me that you may not have a grasp of what it actually means. It is also kind of unnecessary to use if we are going to be talking about the specific functions themselves.
Ne, is not an INTP's highest concern, Ti is, and we are not confined to accepting everything we hear as a possibility, especially if when have an understanding of facts (Si) that would negate what is being proposed. This is not shallow, this is called doubt, and it is our way to testing the strength of new ideas. If this study had proven something substantial about the human psyche, then I suppose I'd have to shift my paradigm, but it does not look like that is the case.
PS: Fuck yeah this is Fe I am using, what of it?
Let me tell you something of where I am coming from. I have made a collection of character/personality types as I've come across them over the last twenty years and put them into a spreadsheet. I was fascinated by the organizationalability of the thing - that one can put people into distinct categories. In the back of my mind was if there are so many classifications I would like to see a way to integrate them. Or if not, at least to compare or translate one into the other. Let me grab my LOTUS spreadsheet and present some. Myer-Briggs and now yours is only one of them:
Psychetypes of Michael Malone - 8 categories
Love - 6 categories
Horney - 3 neurotic categories
Man the Manipulator - 8 categories
Your Inner Child of the Past - 8 categories
Six Personality Types by Taibi Kahler - 6 categories
Freud Childhood Stages - 4 categories
Difficult People, Dealing wth - 9 categories
Basic Bricks of Temperament - 4 categories
Birth Order - 4 categories
Social Style Strategies - 4 categories
Hippocrates - 4 categories
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So you are right about Ti being the highest concern for an INTP (I assume I belong there). I am only in the data collection phase. I'm too "lazy" or otherwise occupied to be scholar here though I could at least give it a preliminary shot, I have not. Like many INTPs, I suffer from the failure to choose. I think that a poor excuse. I should know better.
I know you would like me to drop Ji and Pe. I think I see what you mean. They don't rate as cognitive functions -- or is that the wrong way to put it? The reason why I've toyed with them when I first saw Myers-Briggs, I wanted to know how J and P plays out. I've seen you write about this but forget exactly how you've put it. Where I am coming from is personal as well as theoretical. I personally suffer from endless data collection and a failure to choose something to specialize in. I refuse to specialize as long as I can't account for everything in a theory. Calling something Perceiving extroverted and Judgment introverted seems to fit just right. My perception is shared and objective; my choosing is personal and subjective. If you don't condone this calling this Ji and Pe, do you recognize these traits and how do you propose to place them? (You do have large paragraphs devoted to Introverted Judgment and Extroverted Perception in CF100. (That doesn't mean I understand everything the same way you do. My thinking style in different from you.) Do you prefer they go under Si and Ne respectively? Not to forget J and P are Directive and Adaptive traits.
As to using Fe, INTPs can use it. The question is, can they use it and socially function well? Ti should have something to say about that if the thinking is broad or inclusive enough.
N's 1 S 0 
After all, after passing through the lowest point, one can only rise from there.
