DNS best practice question

Hello,
we currently have an issue regarding DNS in a multiple Domain Forest.
first of all, in the forest there are 5 Domains (names changed):
dom1.domain.org
sub.dom1.domain.org
dom2.domain.org
dom1.url.de
dom.de
As you see, a forest full of Domains not matching ;-)
We also have multiple sites, and as per network requirements, replication is made trough Domain: dom1.domain.org
All other Domains replicate only with this one.
The DNS is currently set up as follows:
Each Domain Controller holds its own domain as primary AD integrated Domain in DNS (Domain wide repl.).
All others are set up as Forest Wide AD integrated Stubs.
Each startup we get Event 4515 on the DCs, that a Zone is available twice.
So, I have to troubleshoot this infrastructure now.
Can you tell me, what is best practice here to set up DNS correctly with less replication traffic as possible?
Best regards

By Default DNS Zone replication Scope is Domainwide but except _MSDCS Zone . _MSDCS Zone replication should be forest wide. In addition Replication Scope can be decide as per your business requirment.
Regards~Biswajit
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