Finally did the 1000 / 800 / 600 / 400 / 200 downhill sprints at 1:45.x for each interval. Plenty of rest, about 1 minute per 100 meter. Very heavy, but nice because of the rest. I'm sure this workout is going to help my 2K!
Sunday (morning), 11-11
10K to break 41 minutes. Steady start at 2:03, @ 24 SPM. Dragfactor set on 112. HR drift stable, reached 180 between 5K and 6K. Hung in, afraid of the 4K yet to come, but remained steady at 2:03 until 8K. Increased speed, pace 2:02 until 9K and finished the last 1000 in 1:58. Finished more dead than alive but very satisfied in 40:46.6 and if you don't mind, that was the end of my 10K challenge....

Failed the 40:30, but happy with the result. This is my limit, for now.