From Ambari 2.5.0, more refinements for whitelisting were included.
So you can add the following property in your ams-site from ambari UI to blacklist the hbase metrics.
timeline.metrics.apps.blacklist = hbase
To know more about it please refer to : https://cwiki.apache.org/confluence/display/AMBARI/Ambari+Metrics+-+Whitelisting
Were you able to implement the HBase blacklisting properly?