@superwaffles321 I'm an INFP 641 and your descriptions fit me quite well. I am 6w5, 4w5, 1w2.
I think I often move a little towards the unhealthy side of things because I constantly have the negative 3 disintegration qualities. I'm extremely aware of how I compare to others. I am not especially astounding or charming like a good 3. But I try in school to please the professors and show how smart or creative I think I am to the other students (when it's appropriate - like during presentations).
What you say about anger is true. This negative 3 quality is usually associated with a frightened, defensive, disdainful and annoyed fury. When people try to give me advice from a standpoint of misunderstanding me, I feel almost enraged. My image is extremely important to me. Yet, I am not a 3 at all. I tested for it many times and only possess a couple of the positive qualities of the type. So, it makes sense that I'm constantly experiencing the effects of 6 disintegration.
As for the rest, my 4 score is almost as high as my 6 score. This means self-expression, usually through poetry, is very important, meaningful, and comfortable. And being unique is very important as well.
With the 1w2 I constantly measure myself and my actions against my concepts of good vs evil. I have to do good as often as I can. If something destructive or "evil" happens in my environment, I am compelled to do something to change it. Like if I see someone being bullied. I will do something. With the 2, I find pleasure in helping others, making them feel pleasant, accepted, at peace, loved. And it seems that that quality plays into my very stringent conception of what it is to be a good,righteous person.
Also, the 6w5 means I'm quiet and observant, I value my ability to perceive things that others seem not to, to have original and powerful insight, and to share my knowledge and perspective when it's useful to others. And of course, I'm constantly anxious, worried, a little paranoid, certainly hypervigilant. And oddly enough, counter to my 4 wish to be totally unique and independent, I feel a strong, strong desire to fit somewhere. To be a functional and accepted member of a positive and supportive community. I hope someday I find a job that satisfies this desire because thus far in my life I've felt like a black sheep almost everywhere I go.
So yeah, I like finding out about 641 because it explains how I am quite well. And to anyone before me who was unhappy about the identification, I think it's valid to be proud, because I assume the lot of us are smart, careful, moral, creative people. And those are great things that you don't see everyday, especially not in one package.
EDIT: I apologize for any typos. I typed this out on my smartphone.