Europa Barbarorum> other mods.
I never, ever autocalced, unless it's a merc army I can't retrain anyways. I usually had just a few main production centers for troops and the rest are just economic colonies, I hated having understrength stacks and the AI wasted a ridiculous amount of troops. Plus I tended to have relatively small, extremely elite armies. Losing even a few troops to stupid autocalc was a pain.
Anyways, Total War battlemap and tactical AI has been retarded since RTW. Original Shogun, good AI. Original MTW, good AI. Then bam, totally moronic AI and useless diplomacy for every following game. Playing VH/VH is the only way to give the AI enough of a handicap that it sometimes ends up as a challenge, and it's totally artificial. Most good mods used Darth's formations, which made tactical AI a bit better, but I haven't run into anything that'll make the AI pull it's head out of it's ass on the campaign map.