I've gone back to playing with just the UI&AI mod. Unfortunately, I find that there are some problems with this mod as it is currently, even though I really like a lot of the ideas and I certainly enjoyed the Union MG campaign I played (up to Cold Harbor).
I really like what's been done to make perks matter more, but I think that it has been taken too far. Especially with the AI units always having random perks, which is suboptimal. For infantry you always want to go 100% Firepower or 100% Melee in perks. At three stars and with correct (good guns for firepower bdes and guns with 80 or more melee for charge bdes) equipment you can get 1200-man brigades that reload almost instantly while evaporating 200 enemies with every salvo, ending up at over 10000 kills in grand battles if positioned correctly (and if the enemy has that amount of troops available). Charge-oriented brigades I have not found as much use for. The Iron Brigade (gifted after Antietam) is completely useless in firepower and gets outgunned by one-star brigades with the 100% Accuracy perk. However, when charging, they catch up to galloping cavalry and insta-deletes anything they touch. They can charge three larger brigades and rout all of them. Because they are faster than other brigades, they can actually stay in melee when a unit flees, which often results in hundreds of melee kills or a surrendered unit.
The AI seems completely unable to deal with any of this. Pretty much all battles look the same: First I get completely steamrolled by an enormous human wave of 5000-man brigades that stumble over themselves and basically cover the entire map. Then I slowly wear them down with my minmaxed 'space marine' units like the Iron Brigade, or '10000 kills' three-star firepower brigade, or my sharpshooters that routs any brigade with two flank salvos... then I completely wipe the enemy army. Every major battle since Shiloh has looked like this. It doesn't feel like the American Civil war, it feels like one of those total war mods where players run in circles around an absurdly buffed AI that doesn't know how to play the game.
I hope all of this doesn't sound too harsh, I really like a lot of the work you people have done, and I understand that modding this game is not trivial (ironic considering the origin of the developer). I think that the type of mod experience I am looking for is something that combines the fixes in the UI&AI mod with increased authenthicity and realism, while making sure that the AI understand how to play and can pose a challenge without enormous AI buffs. I might have to start doing some hex-editing myself..