There is some truth to the fact that those fish get hammered. However, on recent trips there I have only caught between 1 and 5 fish there myself. I would belive that the number s of fish in that location are far below what they were last year at this time. When the water cooled last year and the trout pooled up the fishing there was outstanding. So the real answer as to why you are not having much success there might be due to the shear numbers of fish. Are you fishing the seam below the bridge? The last time I was there there was a good hatch oof winter/summer caddis and maybe one or two fish rose. Last year there would be a few dozen rising to the same hatch in the same location and under far worse fishing conditions.
As to fishing the rest of the pool you might have luck with swinging streamers or very slowly stripping them due to the low water temperatures?