To help clarify, I only emailed the club because I thought the descent was particularly dangerous, cyclists on the audax were going (IMHO) significantly faster than was safe. I suggested to the cub organising it that, had they not done so already, it should be flagged on the audax route as a hazard.
What was actually happening was cars were stopping completely below blind bends as they could realise that cyclists were coming down too fast and if they tried to go up a cyclist was going to ride straight into them. The car drivers were pipping their horns to let cyclists know they were there and to slow down
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This is the road