Upon returning to my own creation, Sumaria, I found I was able to greatly improve upon my original attempts. Two spoiler maps are included. In both maps, the last request completed takes the favor back to 100 for the saves. One map focused on prosperity and favor and attains 100 in each during AD 487, the earliest year possible for 59 peace. The second map focused on favor and completing all of Caesars requests, including the final requests for 320 clay and 320 meat and the final request for 640 weapons. All significant events are shown in the map log as spoiler information.
Not sure if it's normal to give spoilers for your own maps, but why not? :)