AD replication configuration

Hello,

Below is the diagram that I like the AD replication to work like (hub-and-spoke topology) but I am having issues with the replication.

All servers are Windows 2003.

Each Domain Controller is in a separate subnet.  I created different sites in "AD Sites and Services".

I have the following sites:
Site1
Site2
...
Site9
MainSite

I also created all the subnets and associated them with each site.

Inter-Site Transports configuration under IP:
Site1-MainSite
Site2-MainSite
Site3-MainSite
Site4-MainSite
Site5-MainSite
Site6-MainSite
Site7-MainSite
Site8-MainSite
Site9-MainSite

I have have issue with replication.  For example Site1 is trying to replicate with Site2 (this is created through <automatically generated> when I look at NTDS Settings by KCC).  I want Site1 to replicate only with MainSite and no other Sites.  When I manually remove the ones that was recreated by KCC, it gets generated again through the KCC schedule.
Without disabling KCC would be possible to change the settings to get the desired (as shown in diagram) replication?

Thanks!
Drawing1.jpg