no kidding. 4 to 5 was brutal.
From 4 to 5, the only mapped features were some boulders and a form-line spur. Some people said that they saw the boulders, but I didn't (the green-bar vegetation was higher than the boulders), and I tried to stay to the highest ground I could to go up the spur, but apparently I didn't succeed because I ended up about 30m L of the control.
For 6, I just gave up and headed for the open area and then cut up from there, but M had success by going R (wet-foot) finding the low area and cutting back.