Yes I am checking my cities each turn, I just have to get better at recognizing what the best plays are. I think moving forward I'll just move citizens around to see what works best instead of just looking at it and going, "yeah I think that is good."
Honestly, I'm not sure I see a much difference in those two trains of thought.

But actually, what we are trying to get you to here is a state of mindfulness of of what tiles cities should be working. Early on your growth might outpace your improvements for a time, but when you get improvements like food and cottages, you try to work them as much as you can. (well, specials you always work or share between cities depending on growth needs).
So my point at the time was directed at Munich, which was working two plains tiles while a cottage was sitting there unworked between Munich and Ham. (ofc,then I told you to whip the settler anyway as one analysis contradicted a later analysis). I can see an argument at the time to get the Library whip faster, but the counter is growth and growing cottages. Anyway, just food for thought.
Again, basic idea to keep in mind is always work specials (or share as needed), focus growth when growing, focus best tiles when building workers and settlers (always working improved tiles first)
Always feel free to ask if you are unsure about these things. I do try to give some advice on this aspect when I review your saves but that generally only applies to said turn or maybe I plan out a couple, but most of the turns you play you are making the decisions.
I think I've followed your suggestions exactly but I was unsure about "Take cottage when complete with scientist..." in #1. If you're referring to the FP cottage, that is already being worked.
Sorry, I can see that being a bit unclear. I was referring to the cottage in process NW of Berlin. Berlin just completed a Library and was going to grow on unimproved tiles...work a scientist with new citizen. Then when that cottage is complete in a couple of turn, move scientist to new cottage - maxxing growth and growing that cottage. Then Berlin can grow back into scientists so that it runs two of them for the academy. Ideally the point here was that a) you really want Berlin running two scientist asap b) work scientists over unimproved tiles c) but Berlin is growing nicely and we want to grow its cottages d) new cottage has no helper city nor ever will e) lastly - once Berlin grows into 2 scientists I see it will be at happy cap so this works well.
On #5, if you could briefly explain what you mean by "perfect point" that would be great.
This is a tad complex. I'll answer tomorrow as I'm spent.
So I just finished T75 and now I'm on T76. I haven't done anything on this turn yet except accept OB with Maya.
Can't review things tonight..almost zzzzzzz
Finally, since I am sorely lacking in Espionage, can you explain what you mean by "8ep buffer on the threshold"? What makes Pacal or Joao good candidates? How can you tell when an AI bumps his EPs on you? Sorry, I really haven't paid a lot of attention on the espionage aspect of this game.
Take a look at the EP screen at what you have on Mansa. Over on the right look at the line time "See Technology". You have X amount of EPs on Mansa, and need Y amount to see his tech. I forget amounts but the difference was 8ep. (That Y amount constantly changes based on what you've invested in the leader and what they are investing in you) Right now you are ok because Mansa is only investing 2ep per turn. You've been investing 4ep per turn on him.
So you might start investing a bit into another AI. Pacal and Joao are good as they are strong techers, especially Pacal who is almost Mansa like in research rate though less generous trader. Ultimately, you will get a feel for who the better AIs are in the game the more you play, but Mansa is always the best. Pacal, Willie, Lizzie are strong techers, and oddly most Imperialistic leaders are strong AIs in this regard with notable exceptions like Genghis Khan, who sucks.
Anyway, nothing to get hung up on at the moment are far from important at this stage. You can just keep things the same with Mansa for now. Up to you. But do note now that you can see what he is teching. Really helps in assessing trades. Other than you, Mansa really sets the tech pace.