Getting good effects with artillery?

[Apocal]

I need some helpful hints on how to get good effects from artillery. As it stands right now, my guns maybe score one AFV kill for every Battalion 2 DPICM fire mission I get out. I find it somewhat difficult to hit fast moving targets, but I'm not sure if that's realistic and intentional. And most of all I can't seem to get the Cooperhead to work; it fires but never seems to guide onto a target. I have a BFIST in the area lasing (I assume it's done automatically) but it never seems to work out...?

Any advice appreciated.