Nameserver IP reassignment

Greetings,

I have recently stood up my 2nd WHM server without any major issue. As with a kitchen with too many cooks I have ended up with my Nameservers "cross assigned" so to speak.

I have 7 IP's. One of them was set up as the primary shared IP, and another 2 IP's were assigned to NS1, and NS2 nameservers. Another team member was in charge of purchasing 2 security certificates that is licensed by IP. During the setup, they selected both of my NS IP's for the certificates. Since the certificates are licensed by IP, I can't change the IP's on the certificate end without it costing me $.

Questions -

Is there an issue with leaving the IP's (cross used if you will) in this manner? (Me personally - I am not comfortable with this)

How do I go about reassigning my other unreserved IP's to both of the nameservers? (step by step please)

I tried to edit one of the namserver zones as a test, but did not get positive results. Nothing drastic, it just didn't ever use the new IP I assigned. I thougt it best to consult the mroe experienced since I have two clients hosted on this server so they need to stay up.

Please assist - thanks