I'm getting some different numbers for those things.
With no modifiers(wonders/happiness/unite the people) the workshop should spend 67 actions on fuel/cooking. Moreover making fuel from logs takes 4 logs and produces 4 fuel, so for cooking each fish it's 67+67/4+23 for an increase of 75>175 nutrition. That's still not worth it without modifiers.
You don't have to cook the fish though, so it'd be 23 to catch it for 75 nutrition, which is worth it.
I made it to turn 517 before the singularity happened. At turn 500ish I noticed that my passive culture from population was quickly bringing me close to 1 tech per turn and so I started spending those techs on the +10% culture tech. The tech income at turn 516 was 51 techs and that was all I needed to reach Null(read infinity) culture income.
Shamans are not the only class who can miss, all mages will miss far more often than melee. Getting more intelligence will increase your hitrate(and damage) on mages.
I've seen the idea plenty of times before and in plenty of medias, including pc(which i might add had better graphics) cards or a math algorithm in one of my tests.
Old idea is old.
I loved this game. Initially it was sorta confusing, but when I figured it out I got addicted to it. In the end I went to their website and realised something: the ones here are easy ones.
Should be fixed now