Without messing about with stats, I would place Early Legionary Cohorts everywhere, Legionary Cohorts in Italy and coastal Mediterranean cities, Praetorian Cohorts in Italy only and Urban Cohorts only in Rome. I would also extend first cohorts to Italy only, but more so the Romans can recruit them pre-civil war more than anything.
With messing about with stats you can place them almost anywhere and not have to suffer the pain. Legionary Cohorts in my game, for example, are basically the equivalent of a heavily armoured Hastatii (same attack, defence skill and stamina, but slightly higher everything else). Praetorians are slightly better, while Urbans are a little better, yet not much better, than that.
Essentially, any Roman unit will equalise or even get beaten by a similar level unit from any other faction. This appears to slow them down a little, and results in fairer battles.

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