Only thing I can suggest is make sure you are really checking for industrialization in your list after you have finished the other critical technologies. Scroll down all the way until you actually see the option that lets you look at the tech tree because if it is available it will not be on the first page.
Other than that I have no idea.
Its making me go invention, and then industrialization.
I've been trying today to get an economic victory on Warlord... its tough. The closest I've gotten was one time when I unlocked the World Bank with two turns to go, and hadn't built a factory, so I didn't have any overflow. Whenever I take time research industrialization and build the factory, I don't quite get the 20,000 before time expires.
Also, that one game I got closer, I was generating around 2100 gold/turn, while the other couple times I only was getting 17-1800. The only thing that I can think of would be that I didn't get any economic great people those games...
Even with the problems I've been having juggling stuff near the end, its the start that's really screwing me, though. Not having the starting warrior to grab that first barb village sucks, and once I finally get my army up to Teno, it takes, providing everything goes right, a good 5-6 turns to knock Monty out. By the time I have my two settler pumps up and running, its already been way too much time.
So, Vale, by what year do you have your mega-city fully built on Warlord? The earliest I've gotten is somewhere around 500 AD... which is way too late. Any tips anyone?