Adjusting the shadow camera really only works for Spot lights. If you are using directional lights, it doesn't work the same. One thing to keep in mind... the shadow map size, is related to the entire scene size, so the shadow map has to be shared by every object in the scene. If you have a ground/floor prop in the scene, be sure to Disable casting shadows for that object (it's not going to cast ON to anything anyway). This works much the same way as Depth Cueing, btw. I have a mini-tut (or 3) on my artists page about this if you're interested.

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