1. War weariness isn't a big deal in those well-played Con/Dom games. There are several ways to fight it, and if they can even be combined, WW can be neglected:
- First of all, you get the AI to declare on you instead of the other way around. Tricks for that:
a) MAPT deals (combine a Military Alliance against a third party and a Peace Treaty in the same deal. If your target after a while makes peace with the third party, the complete deal gets canceled, including the peace treaty... This gives you war happiness and you can fight them for quite a while, before that WH gradually wears off and turns into WW.)
b) Trap one of their units inside your territory. Make them furious by repeatedly demanding techs and cities. Then ask them to "leave or declare". In 99% of the cases they will declare on you.
- Then of course you need marketplaces in your core cities and luxuries from wherever you can get them. 8 luxes and a marketplace gives 20 happy faces, you can lead war for quite some time, before you'll need to raise the lux slider... (Though usually 8 luxes can't be acquired before Navigation/Magnetism. 4-5 is probably the best that can be achieved in the early game.)
- Make it a priority to capture the happiness wonders (Hanging Gardens, Artemis, Bach's Cathedral. That helps a lot. And on the high difficulty levels, the AIs are quick to build them for you...
Note: the Sistine Chapel doesn't help here, because in a military game you don't want to waste your shields on building cathedrals...
2.
I haven't used the "cut trade route" techniques yet too extensively. I think under GOTM rules most of that stuff is considered an exploit, while it is allowed under HoF rules. The masters in that area are Spoonwood and Lord Emsworth, search for their excellent descriptions.
I think, the main trick is, that you cut the trade route for a resource that you are
importing, not for one that you are
exporting. Then the AI will suffer the reputation hit, not you...
A simple example: the AI gives you a lux resource and a technology, you give the AI 500 gold per turn. (All in the same deal, that is important!) Then you pillage the road between you and the AI, so that they can no longer send you that lux resource. The AI gets the blame for that, and you get a free tech... (The entire deal gets canceled, so you no longer have to pay the 500 gpt, but of course you keep the tech, as that is a one-time good.)
There's no limit to what can be done with deals like this. Just be inventive...
Another common trick (though banned under GOTM rules) involves a dying AI: suppose you are at war with an AI and just about to take their last remaining city. Now you can sign MAs or trade embargoes against that AI with all other AIs that have contact with them. Include whatever you like in those deals. Afterwards you just take that last city, the AI becomes extinct and all those military alliances and trade embargoes (and whatever was part of that deal) immediately end...
For one powerful example read the thread
Exploitive gpt trade with AI here in this forum. It explains the so called "Lord Emsworth Deals", where the dear Lord managed to generate an income of
several hundred thousand gold per turn way before 10 AD, simply by
gifting his money to the AI (in "properly constructed" deals involving dying civs).
Edit: here is the link where Lord Emsworth first published that technique of "iterative LE deals":
http://forums.civfanatics.com/showthread.php?p=6045445#post6045445
The exact numbers:
590.000 gpt in 170 BC
5.000.000 gpt by 150 AD...
Any questions...?