Considering late game stack management is micro-intensive, have you considered making a supply chain system so players don't need to manage 30 stacks of troops? If any owned provinces with a stack connect back to cored land, then the stack isn't over supply limit? This way, you need to slowly siege someone down an occupy provinces so you can always trace a route back to your own cored land. Of course, your units would still take attrition based on terrain type, enemy ideas, and any other modifiers. Just an idea 
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