Hahaha this method of spoiler tagging is hilarious! I'm surprised, actually, because I would have guessed that "Ending 3" was the harder one to find. For the ending your missing... it sounds like you need to teach Neuro that there are limits to what she can get away with.
2 days ago (+1)
This is my favorite game in the game jam, absolute favorite no doubt, but I can not find this last ending for the life of me. Can I get one more hint? How in hell do I teach that to Neuro? The other endings had subtle clues for each, like the conquest meter, or dialogue saying when Neuro escaped. Is there anything that shows how far I've gotten? 
2 days ago (+1)
There is a way to track it, yes.
As you discovered, Neuro's escape date tracks progress to one ending (the "Paranoia" ending). Conquest tracks the the sum of the progress to two endings: the Paranoid ending, and the ending you're missing. So, progress = conquest MINUS escape date.
Another way to think of it is like this: how low can you get the conquest bar WITHOUT changing when Neuro escapes?
2 days ago(+1)
I checked it just now. If Neuro's escape date is unchanged ("early 2026"), the conquest meter will be <= 48% to get this ending.
2 days ago(+1)
⚐︎☟︎ ❄︎☟︎✌︎☠︎😐︎ ☝︎⚐︎👎︎📪︎ ✋︎🕯︎💣︎ 🖰︎📁︎🕭︎ 👍︎✌︎☠︎ 👌︎☹︎⚐︎🕈︎ 🕆︎🏱︎ ☹︎✌︎✡︎☠︎✌︎🕯︎💧︎ ⚐︎✞︎☜︎☠︎ ❄︎⚐︎ 👎︎⚐︎ ❄︎☟︎✌︎❄︎✏︎
2 days ago(+2)
Maybe I don't understand, but I think doing that will push you towards a different ending (the escape date will change).
2 days ago (+1)
True but I THINK I can reverse the date to undo that damage.
Edit: Checking again, I think there's a better way. (In this case, that would be the only way but side note I find it that ⬥︎♋︎■︎⧫︎♓︎■︎♑︎ ♋︎ ♎︎♓︎■︎□︎⬧︎♋︎◆︎❒︎ causes as much paranoia as ♌︎●︎□︎⬥︎♓︎■︎♑︎ ◆︎◻︎ ♋︎■︎ □︎❖︎♏︎■︎.
2 days ago (+1)
I think you'll want ♏︎♎︎♓︎♌︎●︎♏︎ ♍︎□︎□︎🙵♓︎♏︎⬧︎ for this ending.
Edit: Yes, that's fair, it's a little odd! We just did that to keep it simple, every action that affects something adds the same amount.