William, is it possible that the DR async and failover members do not have all of the needed encryption keys loaded? See Activating Journal Encryption in a Mirror in the High Availability Guide. This text applies to releases supporting multiple encryption keys; what release are you running?
please see Murray Oldfield's Caché VMware Best Practice Guide. this extensive and thorough review has a brief section addressing your topic; you could follow up with Murray if you have further questions.
For information on configuring the journal directories using the management portal, please see Configuring Journal Settings in the Caché Data Integrity Guide. You can also configure the WIJ directory using the page described there.