Thanks Bartleby, that's a good trick, just what I was looking for.
Oh boy oh boy do I love the Iroquois. I played another game through, more careful and deliberate this time.
Start: 2 grassland cows on river, second town had 2 plains wheats on river.
Opponents: Maya, Inca, Celts as before.
Dom limit: 303
Result: Domination win in 1275 BC, score 13567
This game was better than my previous game on all accounts, but still not perfect. I had to settle-steal horses from the Mayan capitol, and road over mountains to get there. Research was a bit slower than optimal to Republic, since I worked a number of non-river tiles for better production. I got 5 turns of anarchy, compared to 3 in the last game. But the map was a lot better, and I planned a lot better.
Same strategy as before. Find and hook up horses asap, build a few core productive towns, start building Chariots. Research to Republic, revolt, trade for HBR, upgrade the chariots to MWs and start the GA asap. At this point you should be <20 turns from victory. Build MWs for ~8-12 turns, the less the better, if you can handle the war (shouldn't be a problem). Switch to settler production and fill in the blanks. In this game I built one (1!) temple, the rest was settler fills.