my first saw had a safety chain.. I thought I was a idiot and couldn't sharpen but when I got a real chain, I saw what the deal was. You are not using safety chains, are you?
The low-kickback feature has nothing to do with filing cutters. It can slow down filing the rakers. When properly sharpened, it will cut plenty of wood.
If you can't file 'safety' chain then you still can't file.
JMHO
Philbert