handlebar tricks
hei,
i'm no expert descender either but putting as much weight as you can on the hand that's outside the turn has an almost magical effect, and the bike reacts cutting a much tighter turn.
it takes some practice, but it works. you have to lean forward to be able to put enought weight on the bars, and then kind of 'favour' the hand outside. putting weight on the front wheel makes it bite better and limits washouts; putting weight outside makes the center of gravity shift to where the tyre meets the trail (which I guess is where it has to be). If you can hear the rear wheel skidding -for lack of weight- you're doing fine!
that, and praying, of course!