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I didn't see any reference to unit stacking in manual. Is there any impact?
In other DC games, there was also Battle Points for reduced combat effectiveness of attacks beyond a value of 100.

Overstacking modifier [hitpoints]
Overstacking happens when one of the two sides is having more stack points in battle than the maximum stack points. If you overstack your troops will be more vulnerable (due to being to close to each other) and thus will fight less well. You can overstack in defence as well as in offence.
Overstacking makes attack and defence stronger when considering the totals, but at the individual level hitpoints will be lower.