I may have misunderstood your question. If you are seeing individual vehicle's paths jump around, it is because they are in bypass obstacle and trying to find a way around a man-made (mine/wire) obstacle or natural obstacle they have run into. If you are seeing a platoon or company path jump around, it is the issue I described earlier.
Thanks - works - although I am still getting hammered - will crack this nut ....
I am finding it hard to sequence breaking through the obstacles and maintaining good smoke to limit exposure - timing / syncronizing the attack is difficult - as I expect the real thing is.