After reviewing the WCOC courses, and my results further, I've come to the following self-improvement conclusions:
1) Need to learn to run faster downhill. Foot and ankle strength are especially needed, as is a bit of fearlessness.
2) Need to be able to stay focussed on those long downhills w/o slowing down much, perhaps by better compass/pace?
3) Need to go a little straighter in this type of terrain, and as usual, always compass/pace together with map reading.
The one split I won all weekend (tie) was 7-8 on day 1. On the way up to 7, I picked a bearing, measured a pace, and memorized the map section. I then ran the leg hard, with all that in mind, checking the map only breifly once, and even then forcing myself to not study but just keep moving, because compass/pace was still working fine. That worked even with half the leg downhill, in part because I never needed to check my map on the downhill and could focus on running and footing.
Also, I was especially careful with my bearing, even sighting specific trees ~50 meters away a few times, which gave me extra confidence that compass/pace alone would get me to the bag...
It's almost sad that precise compass/pace seems to work so well because I do like reading the map.