I think you did everything right, except you have used the IP Address of the HDA for the secondary DNS!! Hence your clients are still getting the HDA address twice!
Edit the /etc/hdactl.conf file you created and put in the IP Address of the secondary DNS server in place of the 192.168.33.1. In my case, my HDA is 192.168.0.250 and my secondary DNS (router) is 192.168.0.1.
So in my /etc/hdactl.conf i have:
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$DNS2 = "192.168.0.1";