Only thing lower TC-IC ratio makes is that it's easier to have overloaded TC when you're going for large offences (or you have tons of units moving and\or fighting at once), which have some effect in ESE as long as it's overloaded but here's the beef:
TC -> IC ratio with default 1.5 http://img600.imageshack.us/img600/64/tcic1.jpg
TC -> IC ratio with 1.25 http://img832.imageshack.us/img832/7966/tcic2.jpg
Even with positive TC (and only having 'roughly' 60 less TC with lower TC IC ratio, ignoring the hit caused by dissent) the ESE is under 50% there and if I were to move it in swamp it would drop slightly and if it were swamp + heavy fighting fighting it would easily go under 20% once the infastructure is damaged, regardless of your TC. You would have eventually the same problem even with vanilla AoD + E3 on certain areas that your units are consuming more supplies than you can supply due to the aforementioned reason + ESE depends on your supply routes' infastructure, not just the province the unit is stationed in.![]()
Sorry, Mjarr, I meant my proposal exactly the other way around: rise the TC-IC ratio, so that you get a higher TC. In your mod all nations have less divisions than usual. Combine this with the increased number of provinces of the E3 map. This leads to a higher pressure on the TC of the ai (and the player) because the number of ungarrisioned provinces is higher than in vanilla. Therefore you'll have to help the ai (and the player) to alleviate the higher pressure on his TC by slightly increasing the TC-IC ratio.