First off, congrats on the Rasta bag lambstooth!! It sounds like the bag is in pretty good shape overall so I hope it works out for you.
I don't have much to offer as far as trying to improve the bag's condition. I can understand how you feel though. Have you seen the LAMB rehab thread? I know there are some amazing transformation stories in there. Maybe you can find some ideas in there? Here's the thread link:
LAMB Rehab!