Very interesting, especially about your third function.INFJ here:
I tend to confidently introduce myself to people I get a vibe that they will connect with me in some sort of way. Others that I feel that I have nothing in common with them, or are trying to make a big impression on, I tend to be a bit more reserved and very polite. I tend to be less emotionally gushy at first and don't impose myself upon others. At first, some people might find me a bit intellectual and removed from the rest of the world. I tend to speak about things based off of logical and rational value systems first. It takes a while for the emotional side to let loose. I tend to be much more guarded about revealing too much about myself. I'll let people know the basics about what I like and dislike, but I'm choosy about what I tell people, you never know who will use information about you and turn it against you.
I tend to keep to myself in a group setting. I don't mind talking for a little bit, but after a while, I just lose steam and my mind goes off into daydreaming mode. It's what happens when Ni takes over. I find it difficult to concentrate when there's a lot of people around me when I'm doing work. I prefer to work quietly and alone, excepting when it's a lab setting and I would like to get things done efficiently.
With having Te as my third dominant function, I tend to rationalize emotional stuff. At first, people might think I'm really serious and studious and logical. I'll come up with a scientific explanation for almost anything. Most times I'll default to the INTJ at first, but then warm up a little to INFJ mode.
Depending on who I'm with, I might come across as either cold and distant, or warm but removed. It depends on the vibe I get from the group. I tend to sit on the fence about which function to use, Te or Fe, when I first approach people.