Level of difficulty and why?

[Gaius Scribonius Curio]

I typically run M/M, although there is little challenge on the battlefield I dislike my expensive units getting schooled by a bunch of skirmishers. The campaign difficulty was reasonable, I have no issue with the AI expansion speed, great empires didn't spring up over a couple of years (or if they did they didn't last).
However now that I'm winning easily this time round I'm upping the campaign difficulty to H, just for the challenge aspect.

[Darth Stalin]

I'm playing with ALX.exe (previously played on BI.exe), campaign difficulty is VH, battle difficulty initially was set on M, but later I edited my saved game to H, as I think that M is too easy. I'm playing Romani and my legions just cut through enemy ranks and slaughtered them to pieces; now I have to think a little and work harder to achieve good battle results.
Also I installed improved battle formations - now it looks much better and AI is not as stupid as it used to be before.