Having fished that section of river on the mayfly DVD - not really (it is a bit deeper than it looks because of the clarity and there are loads of fish in it and there is also decent amounts of subsurface "structure"). You are right about the useful camouflage that broken water provides (and this is what is really in operation on the small streams).
One other thing that sometimes comes into play is that when fish are feeding really hard - this can sometimes seem to leave little/no room in their tiny brains for concentrating on potential predators! Or - at least - a lot less room than might be the case under usual circumstances.
It sounds like in your streams the conditions are quite unforgiving, perhaps you could persuade the club to turf in some big bits of "structure"......