Wardy, yeah, they are all lined with trees, and the ruts are all pretty hard and bedded in as many of these have been used for enduros. They are all pretty slow too, and the majority of 2 stroke riders take them in first gear. Not many of these corners are more than 6' long.
I'm not too worried about exactly where I put the front wheel, more about the pros and cons of choosing one line over another, and about how to not lose speed if the wheel doesn't go exactly where I want it to.
Re the 2nd pic, I would have thought the same, that going further up the rut would make running over the top of it more likely. In fact the opposite seems true because it gives more room which saves the inside footpeg, fork leg and inside foot from possibly snagging on the ground.