Yeah I'm going to say ILI.

If you want to rule out / distinguish ESI from ILI, look at the wikisocion descriptions of linear-stable and receptive-adaptive temperaments, specifically these parts:

IJs are both static and rational, so they see reality as mostly not changing and when it does, it's in abrupt "leaps" from one state to another.
IPs are both dynamic and irrational, so they see reality as in continuous, gradual, often imperceptible change. An IP is soothed by this, seeing reality through his leading function.
Introverted rationals have a very deliberate quality to everything they do. Although the wikisocion page says otherwise, I think most IJs tend to fidget quite a lot. IJs are also schizothymic, while IPs are cyclothymic.

Quote Originally Posted by Whoobie77 View Post

Add on that your message is a block of text worthy of tl;dr, and that pretty much assures that you're a declaring & serious. So, we've got Irrational Introvert who is a Negativist, Declaring, Serious Constructivist and who probably has Ni & Fi in their valued stack.

Shouldn't be rocket science.
I agree with your assessments of Negativist, and Serious Ni-valuing. That pretty much limits the discussion to just ESI and ILI... and I can't really see -suggestive or -polr in a lot of these posts, so I've got to go with ILI.