Sounds like the belt is stretched.
As for the bootleg disks, pirate and store bought quickdisks (modified quickdisks) were generally of lesser quality than Nintendo's by FAR. They are ok in short term, but are usually best overwritten. In a couple weeks I am going to post a translated tutorial on how to copy FDS disks. I know I've been saying this forever in other threads, but it is really coming along quite nicely now.
I'll keep you posted.
-Rob