Amazing post braap!! I vote that this gets stickied somewhere.
Little comment. You mentioned about the TPS shorting out. I beleive I had this issue a while back after it started raining. Got in my car and Id start to accerate and if I remember correctly at around 2000ish rpm the engine would completely cut out, kick back in, cut out, etc. This sounds exactly like the fuel injectors just turning off intermittently. Really makes sense now. Cleaned out the TPS and it ran fine, barely made it home, would go past ~30mph.
Also regarding the head temp. Isnt it backwards that the resistance gets larger with a cooler sensor? Isnt a cold conductor a better conductor? AKA superconductors at close to 0 K.