If I do a ping to 188.8.131.52, I get timeout errors. But if I ping OpenDNS or the Level3 DNS servers, all is OK. I liked the Comcast DNS server because it is faster when it works but the timeout errors will cause my browsing to slow-down. What is going on with the 184.108.40.206 DNS server?
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FWIW, the default Comcast DNS servers are deliberately configured to de-prioritize / rate limit ICMP packet based ping probes, so pinging them is not a good method to use to gauge their performance.
For me, 220.127.116.11 was doing the same behavior as all-75's.
So, if ping is not a good measure, what is?
BTW, when I first setup my router maybe 1 yr ago, I did the same tests, and the 75's was consistantly the fastest, with no timeouts.