re: irrigation
It gets even better than that. Not only do I have all those benefits you mention keeping unhappiness at bay, but because I so rapidly expanded all my major growth cities now lie along the coasts and rivers of China and India, where irrigation is not an issue.
I hadn't thought of this when I did so, but expansion is the perfect solution to the irrigation problem, expand until you hit easy irrigation terrain and set up your super growth cities there.
To be honest, I'm stuck, I've completely lost focus on what I should be doing, I'm so far from my normal playstyle and am more than a little bored with the way the game has turned out so far (Oh what shall my city produce next, vans or vans?).
What would you do in ad 80, 19 cities at you disposal (the best of which can be irrigated per immediate), each garrisoned with a minimum of three military units (admittedly, mostly warriors) and possesion of Leo. You're in monarchy, researching gravity with advances every 8 turns at 70%. You have more tech than any other nation (you have Marco Polo's, Piramids and MC) and have a strategically sound position to boot covering a HUGE swath of territory (all the land between Middle East, India and China). Non of your cities posses city improvements (a first for me there as well) but there is a well placed SSC (pop=7) containing HG, KRC, Collossus and Copernicus with vans gathering for Newton. Currently you own in extortion monies circa 1550g while happily at peace with everyone (the Babylonians were exterminated in proper mongol fashion, they've respawned as Zulu's somewhere). This is your state, and the fate of the world rests in your hands.
How would you go next, o wise one, and what would your strategy be?