Hiya,
I meant to chime in earlier to say welcome to the DhO, so...welcome to the DhO!

From your practice thread and your posts in this one, I would agree that you've crossed the A&P; this would also account for the boundless enthusiasm and utter certainty that this, indeed, is the way to go about ending suffering. Chances are, particularly if you're inclined towards paying close attention to your own sensate experience anyway, you've encountered the A&P at some point in the past and so you're in a strong position to recognize the way in which these things can play out. I don't know whether any of this has anything to do with your artistic background, but the ability to conceptualize and express these things so clearly can certainly help in understanding them and discussing them with others.
Dauphin's comment here: "
and this inevitably leads to "searching out" certain experiences rather than simply observing what is happening. This in turn makes it difficult to diagnose where you actually are on the map." is a really, really good point and worth bearing in mind as your practice develops. The maps are simply conceptual models of the territory you're likely to encounter, as curiously accurate as they are they're just another tool that can help improve your practice by having, at the very least, a rough idea of how best to practice to allow progress to occur. Don't get too caught up in them, they'll stand you in good stead for dealing with the potentially difficult phases but always remember that your own direct experience is the best teacher and will reveal everything you need to know.
Practice-wise, I'll try to comment on your thread anyway but in the meantime here's a few tips:
1.
Observe the Three Characteristics in real-time, in any sensation which presents itself; this doesn't mean that you should "note" them or treat them as another object, just see how it is that they can be clearly perceived in every sensation.
Impermanence (Anicca) is the transient nature of all phenomena, including those sensation which imply an observer.
Be impermanence, watch how even "you" as the feeling of a seperate identity doesn't last for more than an instant but how the illusion of continuity is produced.
No-Self (Anatta) which is more subtle than it first appears; look at how, no matter where you look, you can't find this thing called a "self" anywhere other than in tandem with another sensation. Since no sensation can observe another, and since they're all being experienced by "you", the seeming observer of experience, how can it be that "I" am what's observing? Can a self be found anywhere? Check it out, see what you can learn.
Suffering (Dukkha) is even more subtle. What most people consider as suffering is a gross manifestation of this, suffering begins directly after the point of sense contact when "I" objectify sensations, which is the process that gives rise to "I" as the subjective viewer of these
seemingly objective phenomena. Whether sensations are perceived as "pleasant", "unpleasant", or "neutral", there's this tangible sense of tension which arises; it's almost like a pulling
towards something. This may not become apparent until your practice develops but it's something worth looking at anytime, whether you're on the cushion or not.
2. Enjoy your life. No matter how shitty things seem sometimes, this is the only moment you've got to be alive, right here and now. Don't fritter it away on, to quote Tarin, "petty and frivilous desires", all of these things are transient, empty and lead to suffering if either clung to or avoided. Observe, notice, and find something enjoyable in anything which presents itself.
3. If you're going to use the Progress of Insight model as your framework, learn the stages inside out. They'll all become quite clear through practice and experience but try to avoid misinterpreting one stage for another, it's all too easy to get ahead of yourself and it just causes you to go 'round in circles. I know. I did it too.

4. Practice well. If you're aiming for stream entry, get the momentum going; incorporate your practice into daily life as well as on the cushion; live this experience as it unfolds, it's wonderful, even when it may appear otherwise. Go for consistently and accuracy in your observation of phenomena, the speed at which you can notice things will ebb and flow as you go so don't fret about noting 30 or 40 sensations per second, it's something which happens naturally without "you" having to do anything.
Hopefully some of that's of use to you but I'll check out your thread and see if there's anything more specific I can suggest.
Best of luck!