I have this problem too.

 

check out syncmypix from the market. Its free and 100x better in quality of the pics because you can choose where to crop

 

Mine didnt sync all of them either as I have different names than whats on fb, but then you hard press the ones it didnt and select the profile with the number and it then syncs them and remembers for future reference.

 

You just have to wait til the sync is complete. It all depends on how many friends you have. I have noticed it myself on my phones, I have about 500 contacts, but it seems to clear up. Its pretty much the same on the web when you have tons of pictures, it clears up when all pictures cached.

 

I tried this app as well at first and found the same issues. I totally got frustrated and decided to move on with a Factory Reset. I haven't been more happier since the decision, no more issues with Facebook Sync.