If may be too much to hope for, but could the AI be seeking a tactical advantage? For instance if confronted to the front with well armoured troops holding shields, the AI will not use missile weapons, as they will be relatively ineffectual. I've seen several people state that missiles are ineffective against well armoured troops in a frontal assault.
If the AI is presented with the unguarded rear or sides of these troops, or unarmoured opponents without shields do they let loose? They could just be holding their fire, saving their missiles for the opportune moment.
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