Replaced thermocouple twice in 11 days. Pilot lights then gas valve shuts down after approximately 10 minutes. Replaced gas valve, same problem. I have 11" w.c. inlet pressure. when burner kicks on I have 10.5" w.c. outlet pressure.

Gas pressure is fine. I believe your problem is either the location of the thermocouple or, most likely, a somewhat dirty pilot burner.