XMLRPC Sync guidance request

[trevs]

Sorry I don't mean to hijack this thread, but my question is along these same lines. 
I too am running HA/CARP and for DHCP I'm using ISC. 
I have the failover IP set to the other opnsense IP as needed. 
In HA I have DHCPD included in my  XMLRPC Sync. 

This works out great and seems to keep the failover IP set correctly on both nodes. But is changing the failover split each time the sync runs (I have a cron job). 
The info on that field says on the backup I should leave it blank, but then each sync it changes this to match the primary (256). 
Question comes down to should I just remove DHCPd from the  XMLRPC Sync? Or is something else wrong....
Additional question should I also stop other services that have their own HA settings from being included in the  XMLRPC Sync? HAProxy as an example, and prob others I'm not thinking of?
Is there any kind of definitive list of applications that sync themselves vs using XMLRPC?