I wonder what the difference is between an Ni/Fi loop and an Fi/Ni loop. They seem like they would be very similar.
Well since the INTJ have Te as the main source of external info a Ni/Fi loop will be more system oriented.
Paranoia or at least misconceptions about the systems surrounding the person.
An ISFP has Se as the main source so the misconceptions will be much closer to home so to speak.
Centered on the actions and intentions of the people around them.
In the Fi/Ni loop Ni is the malfunctionong part, in the Ni/Fi loop Fi is the malfucntioning part.
Or maybe immature is a better word for it than malfunction.
The aux can alleviate it, but what really needs to happen is the balance of the inf.
But gee you wrote this ages ago, I'm sure you will have figured this out by now.

I won't read the whole thread to find out though.
*Skipping to end, oh a misunderstanding of Si*
Strangely enough, I often have these vivid memories that pop up out of nowhere and make me feel incredibly bad/angry, even when I'm relatively stable emotionally. Seems kind of Si-ish. Instead of seeing it as an indication of the future, I just dwell on it, as if that memory is all that matters.
I tend to live in the past, the present (within my mind), or some sort of alternate universe that you can maybe call the near-future. I can sort of fantasize with my eyes wide open; I'll see the external world in front of me, but my mind is just some place else.
No it isn't Si it is a memory, memory isn't Si.
Si is percieving the world to be multiple layered memories stacked on top of each other.
That rose isn't a rose it is the icon of every rose you have percieved.
Se sees the object, Si sees a subjective palette of everything that is expected to be there.
You remember a snapshot of what you percieved the objects to be.
Having Si is being surprised when you come back later and the objects have changed.
And then denying the influence of the objects to the point of absurdity.
Before you finally implement the changes into your palette and start over, expecting this new change to be permanent.
Don't mistake Si for memory that is an annoying little MBTI meme I keep running into.

Si is more like believing that every thing one sense is it's own little spirit. The spirit of christmas ring a bell?
Don't anyone read Jung?
http://www.wikisocion.org/en/index.php?title=Psychological_Types