Thanks René. Well, that was one of the issues I meant in the latter render, forgot to use a max slope. It looks pretty weird indeed. And actually I prefer using a procedural base to get the gullies in, mainly for changes of terrain/rock seeds, and corresponding 'easy' stonefalls. But you're right, with small numbers and an established terrain a painted shader would be the way.
And it doesn't sound pedantic at all, any input from you is greatly appreciated!