The /oracle/client/11x_64/instantclient/libnnz11.so & /oracle/client/11x_64/instantclient/libclntsh.so.11.1 is no symbolic link
I am aware of that.
In fact I am speaking about these symbolic links (probably more) you have created.
lrwxrwxrwx 1 root root 21 Apr 30 10:46 instantclient -> /oracle/client/11x_64
lrwxrwxrwx 1 ora<SID> dba 6 Apr 30 11:22 10x_64 -> 11x_64
That is the only thing I can suggest without seeing your system.
I don't want to misguide you with suggestions which I am not sure of. This is the reason I asked or the output of certain commands in my previous replies.
If I were you I would modify the environment variables of the sidadm user and create the Oracle Instant Client directory in the way it is mentioned in the SAP note 819829
Good Luck
RB