We will need to settle the northern Fish (edit: Crabs? West of the Whale) site ~T135, or else spend some late turns in Universal Suffrage.
It's fine to switch to US in late stage as long as we are in GA. However, the coastal city required to attack the barbarian city need to be settled as soon as possible so that it could build a galley for itself. We can't wait very late to capture the city.
The current Fort stickies should be removed. The plan could only work by gifting Adulis to Tokugawa before we found the Fish Island:
Yes, those forts are no longer valid after Folket proved with a test.
Spoiler :
Another problem is that Forts need to be in friendly territory to be accessed, so all the NE Ice tiles will need our culture (or that of an AI with OBs).
Let's give up the fort plan
There are lots of short- and long-term economic techs. Printing Press will add 30-40CPT. Banking will add ~100C per turn in Representation (~20 cities * 6 = 120, minus one foreign trade route). Emancipation would double Cottage growth, Corporation offer +1 trade route per city.
T130 3rd GA does not help to get PP earlier since it'll done before that. Unless we want to beeline to Bank immediately, Getting Banking is decided by AIs or our war progress mostly. That why I said T130 GA won't have any impact on any important tech.
The total yield of extra citizens (delaying the Taj by 5 turns) would mean that we will need to have as many new citizens in the last five turns of the final GA (T155-T159) as we would have had in the final "free" turn of a GA started on T155. That will not happen.
The difference of 3rd GA from T130 and from T135 is difference of the extra GA yield of empire from T130-T135, vs T141-T145. If there are average of 20 more citizens working from T141-T145 than T131-T135, then the yield from a later GA beats the extra turn of GA on T130 (~100 tiles). My writing looks wield.
The flexibility argument for civic switches is fair enough. OTOH, reaching Democracy sooner is another source of flexibility.
Forge first adds 5HPT and takes 4 turns to build. After that, the Monastery takes 2 turns to build. We gain 10H in those two turns. Invert this, and the Monastery (finished in two turns) contributes 40B while we build a forge (finished in 4 turns).
40> 10
for me.
Make sense from numbers. However, remember what I quoted? If the war progress is more likely to be the bottleneck, then 40B is less important than 10H, which might speedup a Cui.
The reason why I start to worry about the war progress is because we have to win by either domination or conquest. Since we can't war with 2 AIs in the same time and in the near future, assume each AI takes 10 turns, then 4 AIs need ~40 turns, that's almost T170.

.
> 10
for me.
) and it means whipping 3 GL cotts
as I mentioned, the yield of both way is not a big difference. However, I usually prefer a more flexible way.




