Mostly I mean the following responses you got to getting the fish-city up quickly.
OK, here it is different since no border pop is required (no wasted 30

, then 10T waiting period). However, the point remains that improving seafood costs 30

(and you need to have a way to get them quickly) while improving a

-resource with a worker costs nothing but worker turns. In your fish city you spent those turns building mines, which admittedly are somewhat useful later. But that's later, and right now we shouldn't care much about later. So while putting 30

to a work boat is productive, maybe some other site that is less draining to your empire is superior, since setting it up costs less

and worker turns?
Sounds OK, if you whip settlers asap when available. Waiting for bigger overflow certainly just slows you down. I'm also assuming you have no granaries, because they are a big investment thus slowing down early expansion a lot, not to mention that the

-cap is low, mitigating value of granaries. In cities with many grass cottages available, just growing to

-cap and slow-building settlers/workers is a good option. Also depends how much chops available of course, you are correct in that a lot of attention needs to be paid on getting settlers/workers out.
This is also why I dislike your handling of northern seafood-city in your T54 save, it has drained a lot of worker turns (roads, mines),

(workboats) and now needs to build a granary, only then it starts to contribute to your settler whips (whipping with a granary also makes those mines rather marginal)... There must be some other way. After putting all those resources into this city, I think the best is now to slow-build settlers/workers @4, because you will get them faster that way. I think even with a higher

-cap (say we were CHA) I'd prefer this to whipping. EXP would change things certainly.
So, since it's a city that needs a lot of attention, I'm not sure if I would have prioritized it and certainly not wouldn't handle it the way you did. Helper 3E1N of cap could be better IMO (can also borrow corn, can work cottages, is connected), cow-horse could be prioritized... I know I'm ruthlessly bashing your save

but I only dare to do that because I know you are a really good player.

So while I'm at it, I dislike the road, the unworked cottages and the unchopped forests.
1.improve food 2.chop 3.cottage 4.connect in this order gets you really far.
Since I'm not a specialist on this, I'll just say that things are looking good.

Knights need more love.