And I read on racing forums that other marathon racers similarly believe in a slightly bow down resting trim. However, I see at least a minority of marathon racers on those same forums who prefer neutral resting trim, or who believe it depends on the hull shape of the particular racing canoe.
As Openboater points out, it may also be relevant whether you are paddling upstream, downstream, upwind and/or downwind as to what trim is most efficient. And again, the OP asked specifically about twisty rivers where there is not the same top speed potential as on open water.
Olympic sprint canoeists go faster than marathon racers and do everything possible with equipment and technique to win by millimeters. Below is a video of the 2011 world championship 1000 meter race.
Are these canoes bow down at rest? Are they in neutral trim at speed? I frankly don't know and can't tell. The bobbing of the entire hull caused by the solo paddlers' weight shifts and stroke movements completely mask to my eye any hydrodynamic bow lift. If anything, I think I see the sterns get closer to burying during the bobs than the bows do.
In any event, I think this thread is the ideal venue to discuss and explain the hydrodynamics of bow lift and trim, not at the end of some hypothetical race.
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