How do I switch which of my 2 WLAN controllers is set to be the controller that accepts new WAPs?

Hello:
I have 2 WLAN controllers, a 4400 series and 5500 series controller.  The 4400 series has 100 seat limit on it, with 74 Access Points currently connected.  The 5500 series has a 250 max, but we bought it with only 50 licenses, and it is max'd out at 50.
The 5500 controller is the controller that has a DNS entry so that the Access Points will know to find that controller as they're being added.  BUT, because we've reached our limit of 50 licenses, I'd like to be able to set the 4400 series controller to be the controller that new Access Points try to connect to.  By going back to the 4400 as the controller that new Access Points connect to buys me time to plan for more licenses on next years budget for the 5500 controller.
Does anyone know how I can do this?  Does this make any sense...seeing there are 2 WLAN controllers in my environment.        
Thank You,
Jon         

Thanks, I'll try this in the morning.
I thought of something this evening while at home...Seeing I have 2 WLAN controllers, only the 5500 is listed as an A record on my DNS server.  The 4400 is not listed.  The 4400 is the one I'm attempting to enable master Controller Mode on, so that the 4400 can discover and manage any unmanaged APs.  I enabled Master Controller Mode, but I never changed the DNS A record's IP address to reflect the 4400.  If I change the DNS entry to be the IP of the 4400, then enable Master Controller Mode, do you think the controller will then see the APs?  I ask because a few threads ago, I asked Stephen which name to use when assigning a name to the primary controller...use the name on the controller or the name in DNS.  Stephen replied: "no, the DNS entry is specific to the discovery process. You want the IS-WLC-2 in the 'primary' name field."
So, I'm hoping that switching the A record to be the 4400's IP address AND enabling master Control Mode will allow the APs to be discovered and managed.  Does this sound plausible?
Thanks
Jon

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