i play mods at high diff levels, so when i can, i like to use custom scenario, so i could set: no tech exchange allowed, because the game is more balanced at my advice, but when i test a new mod for me like with visa, i use mod presets to understand balance of powers of modders.
Visa is stable and with the right graphic sets is smooth, i love the new civics and the new wonders, i pay a high price every time i restart the game because i am not used to the tech tree of the mod.
I Like to discover Christianity and have free religion and free speech, i am mostly a sailor, but i choose german to have power in ground, but i go messed a lot with the new tech tree and civics of visa.
i am used to be first in tech in my games but with visa is really difficult because tech trade makes it hard, and so many new wonders and civics makes it more hard.
Lets assume i go for optics, to dominate sea before others and discover new world, if others civs exchange techs too much i couldn't stop them and i must to exchange techs to stay on the same levels of others.Without tech exchange we will have a more real world because the tech will depends from resources and position at start up.
In my games with visa mod presets. we discover gunpower about 1100 and flight in 15 century. I saw their first ss casing in 1500 that was a bad moment for me and i restarted the game.
Is a lot difficult to fine tune a mod with normal speed, but i think that stopping the tech exchange could help a lot.
Anyway i restarted the game again, so i couldn't talk
about late eras. i will talk about when i will win my first visa mod

any1 has done a walktrough in visa tech and wonders? it could help a lot to choose a better right path.