Thanks Jon. I like input/feedback like that. The offset is indeed about that much, very shallow, boggy depressions. Thery're not supposed to be very deep, but I agree that the grass isn't coming out very well. It needs far more variety in height and structure as well. I try to do as much with as little as possible, but it needs some more pops, I guess.
With grazing in the area the canopies would not be very low, but I will have a look at that again as well. Maybe make some new trees with lower canopies. And I agree about the heather, played with the height, but have to adjust.
These are some photo's of that type of terrain.