[Dion]

I often wondered that too, from my experience a 1,000% Arty Effectiveness makes it too easy to kill enemy units, even with suppressive fire, so I believe Z-fire is indeed connected with Arty Effectiveness. There's nothing wrong with a 100% Arty Effectiveness, as that should pin most units in just a few rounds, if not immediately.

If your experiencing unrealistic results with a 100% Arty Effectiveness, it could be caused by something else, like small caliber guns, and remember it's more common for artillery to cause the target to "hit the dirt" than cause KIA's. A lot of the big caliber guns cause KIA's pretty easy.