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You should not modify directly instance parameter SERVICE_NAMES for a RAC database: http://docs.oracle.com/cd/E11882_01/rac.112/e17264/adminrac.htm#TDPRC200.
Thanks. I didn't know that. I'll remove everything and start again without adding it manually first.
In addition to not adding the services with ALTER SYSTEM you should also try lsnrctl status on all your scan listeners to check if the service gets registered against all listeners correctly