RMAN :: Looking At Different Location To Restore On Physical Standby (10g)

I have 2 databases. Primary ( DB1 ) and Standby ( STBY1 ). My standby database went kaput, and i have as a result deleted the standby database in order to re-create it from a full primary backup.

Oracle 10g R2 on Server 2003.

I have followed several guides, and at this time i have done the following:

- Configured standby re-do logs on primary
- backed up current controlfile for standby
- backed up database plus archivelog
- configured the tnsnames
[code].........

The problem is here. I connect to RMAN from standby

rman nocatalog
connect target sys/password@ DB1
connect auxiliary /
run{
set until scn xxx;
duplicate target database for standby dorecover;
}

I receive an error message saying that it cannot find the file location of the backups that its trying to find. I see in the error that it tries to look locally for

E:FLASH_RECOVERY_AREA DB1 BACKUPSET2013_02_12), however the actual location is (E:FLASH_RECOVERY_AREA STBY1 BACKUPSET2013_02_12)

I have read that the locations need to be the same, however the instance names are different, and i thought i changed the pfile to accommodate that. My assumption is that i have made an error in the pfile. However i cannot see any issues there. Some things that i have changed in the pfile for standby:

*.db_file_name_convert='DB1','STBY1'
*.db_name='DB1'
*.db_recovery_file_dest='E:FLASH_RECOVERY_AREA'
*.db_unique_name='STBY1'
[code]........