This thread is really interesting. I have two INFJ friends - an ex-roommate and a guy I've been friends with since middle school - and an INFJ parent, so I can relate to some of it (though not with one of the INFJ friends as much, because he's a straight man). And the ones I don't relate to are still fascinating, and I have questions about them:
2) Need for resolution - What may look to some like being nitpicky or unforgiving or even holding onto the past often has more to do with their need to geteverything put away in it's proper place before closing the chapter on it. Without doing so, it keeps coming up again and again.
I had never even considered this mindset as being possible. And in the case of holding on to the past - speaking as someone who also has a compulsive need for closure - why not tidy it all up in a much nicer and more calming way by forgiving, or moving on, or putting things in perspective?
11) Get less receptive to advice if the other person tries to skip over the venting that they need to do in order to bleed off excess emotion or when they feel the person hasn't taken enough time to understand the situation. Often their solutions are gained primarily from discussion with someone, not from getting the answers from someone.
I've seen this sort of thing from my mom and my ex-roommate plenty of times, and, though it makes sense and I understand it, it's still sad for me sometimes, because - and I don't know if this is the case with most INFJs - I think they take me for granted in situations where they vent at me in the guise of asking for advice. I would be totally fine with it if they would at least acknowledge the fact that I'm listening and being a good vent-ee, but it never happens, so I feel like I'm being used.
19) Stubborn - I tend to need a lot of convincing with a new idea before I will adopt it, because it involves changing the whole structure over again.
This concept is amazing, and completely foreign, to me. "Changing the whole structure"? Could you elaborate a little for a poor confused ESTJ?
22) Sometimes my very closest friends may feel that I disagree with them but don't express it. That is occasionally true, but if it is not a huge issue of integrity, I'm not sure how expressing it would be helpful. And yet, I don't think that I have to change my mind about it either, as long as I still like and respect them and am not being passive-aggressive. I think INFPs are much better friends in this respect.
My INFJ guy friend intentionally withheld his political party from me for years because he "didn't want to offend anyone", but that action in itself offended me, because - and this might be immature - it's the same thing in my mind as saying to someone "I have a secret, and it would make you really mad, so I'm not going to tell you." I hate it when people I really care about keep things from me. I'm all about having everything out in the open, and when people withhold things from me for no reason I can think of, it's frustrating because it makes me feel like I'm not worthy of full disclosure, which is sad because it puts the INFJ on a different trust level than me because I ALWAYS disclose everything with my friends. It's as if the friendship isn't mutual anymore. Not that this is how it is with other types, but it's how it is with me - even though it's not an integrity thing, it's still completely and utterly maddening sometimes.
I'm wondering if any of these traits are influences by enneagram (1w2 so/sx) or if they fit with other INFJ's experiences (or those of other types with INFJs). Oh yeah - and did I mention long-windedness?

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I think some of it definitely has to do with your Enneagram type, because I entirely relate to #6, 7 and 10, and 18 when under more stress than usual. And we have the same Enneagram type
Since you mentioned "frustrating" issues, here's one that has always bugged me about two of my three INFJ friends (and please, INFJs, don't go for my jugular on this one! I like you guys a lot! Really! I'm a friend, and I'm unarmed!):
Numbers 12/20 (overburdening yourself), 14 (responding and not initiating) and 16(not expressing opinions), among other factors, seem to sometimes lead to what I'd call, for lack of a better term, a "martyr complex" - i.e. it can make it so the INFJ tends to become a passive victim of other people's actions towards them. This can make it tough for Fe-inferior people such as myself to deal with INFJs when they're in that mode. On the one hand, terrible things have happened to them - they're overworked, overburdened, overused, underappreciated, and often blaming the world at large (or, in my mom's case, particular groups of powerful people, making her ventings sound like conspiracy theories) for it. On the other hand, they are also to blame, sometimes more than the world at large, but it's not like you can say that to them - it would be insensitive, and the INFJ would yell at you. So what do you do, besides nod and make sympathetic noises every once and a while?
Again, I love INFJs, I really care about the ones in my life, and I want to be able to comfort them, help them and make them happy.