[knot-dns-users] Query timeout when testing

Hi, We're using the latest version 1.2.0 after updating from 1.1.0. It seems that when we run a dnsperf against it, we now get many query timeouts. It isn't that we're overloading the server, because we can run a 2nd server with dnsperf and get similar throughput (22k qps) but it too has query timeouts of about just under 1%. This seemed like maybe it was the response rate limiting, but it says it is off by default. To be sure, I set the parameter in the config to be off. Am I missing something? Is there something else I need to turn off? Thanks for any guidance anyone can provide! Jonathan