DNS Server, im stuck

Hello all, i hope someone can help me... i have more than 1 week trying to make this work but.... First My Scenario:

I have:

• 1 Domain (mydomain.com)
• 2 VPS with cPanel (server1.mydomain.com and server2.mydomain.com)
• mydomain.com is hosted in server1.
• In my server1 i have ns1.mydomain.com
• In my server2 i have ns2.mydomain.com

My two servers are clustered, so when i add 1 client in one server the dns zones are replicated to the other server.

I bought a new vps, and i call it server3.mydomain.com in this server i installed virtualmin and is running perfectly, i want to add ns3.mydomain.com and ns4.mydomain.com to this server, BUT i dont want to host mydomain.com to it (because it is already hosted in server1) I DONT want to cluster this server to the others, i want it independent... so when i add a new client to this new virtualmin server they add ns3.mydomain.com and ns4.mydomain.com to his domain...

mydomain.com is a godaddy domain.

I already add a host ns3.mydomain.com and ns4.mydomain.com pointing to the ips of my virtualmin server,

And in Virtualmin i clicked on "Webmin>>Servers>>BIND DNS Server>>Create master zone>>

• Domain name / Network: server3.mydomain.com
• Master server: ns3.mydomain.com
• Email address: dns@mydomain.com
• Clicked in "Create" Button

Then i clicked on "Address Records" and i put:

• Name: leaved it blank
• Address: My Virtualmin ip1
• Clicked in "Create" Button

Then i clicked in "Return to zone list"

Then i clicked on "Address Records" again and i put:

• Name: ns3
• Address: My Virtualmin ip1
• Clicked in "Create" Button
• Virtualmin created a record called "ns3.server3.mydomain.com" so i clicked on it to edit and change it to "ns3.mydomain.com".

(Im only trying to setup ns3.mydomain.com to make it work then, when it work i will to create the 2nd dns ns4.mydomain.com)

Its Not Working, what im doing wrong?

Can somebody help me?

Thanks...