Hello,
Have you used scanner to rebuild the indexes, set the client browse and 
retention to match and attempted directed restore, do you see the files in 
directed restore ? Only for the files you are running into problem with ?
How about cleaning your drives prior to restore ? ( long shot but atlest 
you can eliminate any issues with drives)
Do you know how old the data is ? what version of tape drivers were used 
while backup, any other differences that you can overcome without 
disrupting the backup environment ? Since this restore is critical for 
you, it may be worth taking additional steps to get to the data.
Are you recovering over the lan ? if so can you recover to local server ? 
to eliminate any Network issues such as resets, errors that can break the 
restore process ?
HTH

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