If there are roles, are they checked off for the servers, both the source and the destination?  Try checking off the roles for the two servers to see if replication of the documents then occurs.  When you replicate, try using the parameter -NOPIRC to see if this makes a difference. Also, under Replication Options, click on the Other tab, and clear the date and time shown under "This replica includes deletion stubs for all documents deleted since."

If not, the replicated server will prohibit it.

5 minutes is way too fast and a little silly. Sure, someone will say "Oh, but ...", but it's not realistic.

If it were realistic, these servers would be clustered.

Why not set up an agent to run on the sending server and trigger when documents are created / modified in the sending server? Tell it to replicate with the receiving server.

In addition to servers access check , make sure the replication is (push/pull).

Also, you can monitor on server console how the replication is going by increasing logging level.

https://www.ibm.com/support/knowledgecenter/SSKTMJ_9.0.1/admin/conf_log_replication_r.htm

once you determine the problem and making sure you replication settings are right:

https://www.ibm.com/support/knowledgecenter/SSVRGU_9.0.1/com.ibm.designer.domino.main.doc/H_ABOUT_REPLICATION_HISTORY.html