Not sure if you realize. Apart from favouring roman's too much, or in your case favouring the human player challenge for the Carthies. There are no more faction slots available in EBI. In order to create an evil twin of the romans you would have to completly remove another faction. (And if I had my way it would unfortuanetly be your damn carthies.)
As for manpower, I think you might mean population that can be used for making armies. The AI factions have UNLIMITED manpower. Everytime they recruit a unit they get somewhere around 200 or so people added to their city. If your unit size settings are really low then the cities can actually grow much faster than is normal.
Everything you have suggested to fix it is impossible or has already been dealt with in another way. Its unfortunate, but the AI is being asked to do something way more complex and out of its league than what it was programmed for. And sadly cannot be modded to fix this. Keep in mind that some AI modding is possible in M2TW. i recommend you have a look at Broken Crecent for some pretty decent diplomacy AI especially in regards to alliances. EB2 is being made now and hopefully the team will do everything they can to get the AI working the way they want for that mod. We can only wait and see.
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