My442 - thank you for the suggestions.
This is a long long boring story, but there are a couple of us here that think the problem is air being sucked into the rear cylinders when the pedal is released fast, without any fluid leaking back out. Sounds far-fetched, but is the only thing that explains what has been experienced and is apparently more than just folklore.
I do appreciate the suggestion on bleeding, and wish my problem had been caused by that.
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