I assume you are changing the port for security purposes. I suggest just keep the same port and instead use encryption. However, if that is not possible, as mentioned, you can use the "cluster log-forwarding create" command to change port number.
As for the logging question, what you see are the default filters. I suggest, create your own filter and rules, create the destination, and assign the filter to the destination:
<DOT 9.1+>
event filter create -filter-name <filtername>
event notification destination create -name <destname> -syslog <syslogname or IP>
event notification create -filter-name <filtername> -destinations <destname>
event filter rule add -filter-name <filtername> -type <include/exclude> -message-name <message>
If you are unfamiliar with setting event filters and destinations, you can read this KB about Ontap logging and its corresponding "Additional Information" links:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/Overview_of_ONTAP_Logs