I just ran a balanced test (i.e. not trying to get Sailing ASAP) and here are my results:
Sailing T35
Galley T40
Science: 4 pops; 95H in SH; sheep, horses, rice improved, wine farm, two plains river farms; needs an MP unit soonish
Cows: 3 pops; 7OF hammers into galley
Canal: 2 pops; nets T34 (could also be an exploring wb); 3/30 in monument
exploring wb1: T22
exploring wb2: T30
wb3 for nets: T35 (JIT)
Basically, I worked the strongest tile (other than the fur camp) most of the time. Science worked the wine farm rather than the rice farm a couple of turns to pull in Sailing a turn. Cows focused on hammers to get the monument and exploring wbs done; Canal worked the 2F2C tile and then a 1F1H tile to get the wb done.
If we instead focus on working commerce tiles, Science would be 3 pops, Cows won't be able to finish all 3 wbs and monument, Canal would not have a wb yet.
I'm assuming that in LC's testing, the focus was on working commerce tiles which pulls in Sailing but slows down the development of our current cities. It might also sacrifice exploring wbs but I'm not 100% sure about that.
Should we focus on Sailing (and Galley) ASAP, my balanced approach, or something in between?
If we are committed to sending an exploration workboat, then canal has to support itself ya.
Hmm, T40 galley seems like a good all-around goal to shoot for.
I want to develop Silver City at the expense of Cows more compared to your test game.
Here is what I got.
1st workboat exploring just like yours.
T34 Sailing and T40 Galley.
Silver City should be getting a silver mine at size 2 to help get monument out faster.
The sacrifice is the improved tech spend and lower production means Cow can not work improved seafood until T42 because it has a 19/30

workboat it has to finish after Galley.
In your test game the improved seafood occurs right away, but using it pushes Galley back to T41 I think.
In my test game Science can skip working rice a little for unimproved wine tile and we can squeeze Mining in on T38 by working fur.

Uhh, might also have to work 2 sea tiles in canal too.
Anyway, the capital worker can start on Deer T37 and Cow city can work cow, deer, and improved seafood on T42.
Capital can build another worker after Stonehenge to go make more fur camps.
It is quite similar to what you were looking at.
**Edit**
Fixed
T40 galley sorry.