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A simple way to remove attrition as an issue is to edit the land_province section in the common/modifiers folder, increasing supply_limit to a higher value, making it harder to exceed the supply limit in a province.
 
A simple way to remove attrition as an issue is to edit the land_province section in the common/modifiers folder, increasing supply_limit to a higher value, making it harder to exceed the supply limit in a province.

Okay great, I’ll try that first. Do you know if there is a way to decrease the ratio of men lost to supply?
 
In response to the first question, go to \ImperatorRome\game\common\modifiers and edit that file at whatever difficulty you're playing* by adding

Code:
    global_supply_limit_modifier = 2

or however much you want to increase the supply limit.

As for the second, in the same place, similarly add:

Code:
    land_unit_attrition = -0.5
    naval_unit_attrition = -0.5


* Eg:
Code:
very_easy_player = {
   global_manpower_modifier = 0.5
   global_unrest = -3
   ruler_popularity_gain = 1
   ADD HERE
}

You could do this more elegantly, but it would require a mod.