Ok, I've looked at your save.
Salamanca was a waste, worthless. You should have razed it. It has pigs (which are outside of current borders), coast, and that's about it. Tours is ok though, but is too close to Tabriz. In case you didn't notice, Tabriz pwns Tours. Conquer Tabriz and Tors will be fine, they can evenly split their 4-tile overlap between them.
I do have one major objection though. FOR THE LOVE OF GOD AND ALL THAT IS HOLY, EXPLORE YOUR SURROUNDING TERRITORIES!!!!!
There, I said it. Exploration brings contact with more people sooner, let's you judge your rivals strength better, and determine where to attack. It's cheap too, all it takes is about 2 units dedicated to galomphing around until all blackness is gone from your continent. Trading world maps helps too (but you need paper of course). The more you have explored, the more your land is worth. It requires open borders, sure, but you're hopefully not going to be at war with all of your neighbors.
As for being behind in techs and such, I would say it's because you've just sat on your economicly inferior ass for the last 1,000 years. If your rivals look like they are going to be getting too powerful, you need to go and take them out, and take their cities. Your military is using up 1/6 of your economy, you should using it to increase your economy. Kublai Khan, the lowliest of the AIs here, has 3 times your GNP. This is partly due to his lavish gem deposits, (which incidentally would help you with your luxury shortage as well), but also because he had soft land which he was able to develop into a rich cottage-haven. He also has large sugar supplies. He lacks though, the impressive production capabilities that you have. You should have conquered him long ago.
Not just razed a couple cities and call for peace either, you should have conquered his entire darned empire. It's so rich that it would easily pay for itself. Luxury resources are very much worth starting wars over. You seem a little hesitant to conquer large numbers of cities, but this isn't really grounded in much reality. Conquering empires is like eating a big meal, you just have to slow down and digest it for a while, but afterwards you'll be doing marvelously. Just make sure that you don't get interrupted in the process. That's what screwed you over in the copperless game, the fact that the mongols attacked you too. Had that not occured, you could have been a nice happy imperial ruler.
You also need to focus your military more; you're generally not going to need more than 1 unit in your core cities, and so the rest can be dedicated to your offensive efforts. Orleans has 3 units in it; 2 units that could be used in a war. You also built too many spearmen. Unless you are facing a huge mounted assault, or lots of war elephants, you can make due with about 3 of them. They just need to be able to slaughter any mounted unit that comes near, and since they usuallys fight winning battles, their casualties are consequently low. The don't rally need to many combat promotions to do their job effectively, and so make good medics.
But anyways, your difficulties lie in 3 main areas: You are a militarist who is afraid of empire. You don't explore and scout out your world, and consequently fight blind. Exploration also opens up new trade-routes faster. You need to work on the intricacies of empire maneagement, such as managing the growth of your cities (why is Tours only size 2?) and the specialization of your cities. Both Paris and Orleans are trying to be production power-houses at the same time as they are economic power-houses. You also have several areas that are cottaged but un-worked, and Paris is far short of its size-13 population limit. Your empire is under-utilized. Your total food production in all your cities is 89. Your rival worst is 130, and your rival average is 170, double what you have. I was also able, through trade negotiations and re-assigning workers, to increase your base commerce from 110 to 130.
You do have a very good start position though, rich enough to fund an imperial war, and productive enough to win them. I'd like to see a much earlier save, to see what the situation was back then, so I can more fairly and adequately judge your progress.