EncryptionMethod=1 (TL)S/SSL and EncryptionLevel are they mutually exclusive?

Like to know whether the options EncryptionMethod=1 (TL)S/SSL and EncryptionLevel are mutually exclusive? We have ran into the issue with double encryption when EncryptionMethod=1 and EncryptionLevel=REQUIRED on the client side. How can we avoid this double encryption issue? We added "SQLNET.IGNORE_ANO_ENCRYPTION_FOR_TCPS = TRUE" into the sqlnet.ora file which did not resolve the double encryption issue. 

- Do we need to add "SQLNET.IGNORE_ANO_ENCRYPTION_FOR_TCPS = TRUE" on the client side? - Is there the option on the client side not to implement EncryptionLevel to only do TLS/SSL when setting EncryptionMethod=1?

Any help that can be provided will be appreciated.