I have _msdcs Active Directory Integrated. Do I need to enable Zone transfers and notifications on changes? I have 2 domain controllers with DNS/DHCP enabled on them? I would think yes, but it's disabled and I am not sure why? Windows 2008 R2 controllers were migrated from Windows 2003.
It should replicate using AD replication, therefore zone transfer settings should be irrelevant.
Do you have any DNS and/or AD replication issues?
Since these are AD integrated, they do not need zone transfers enabled. Turning that option on would only be needed for standard zone transfers (e.g. you had a bind secondary).