What I meant was, I'm having the same problem he's having in my 74, but it doesn't have the buffer. I think the sandpaper idea is the best yet. That's essentially what the gunsmith said that they were going to do with my AK (after I'd given it to them, of course, and over the phone). I'm also having them check for a bent piston. The thing is, with the loose tolerances of an AK, a little thing like dirt shouldn't matter. Metal malformation, however, can be a very bad thing.
Edit: looking at the picture of the recoil buffer that was posted. I think some people disconnect the spring from the (don't know the technical term) little metal thing that keeps the receiver cover on. I just spiraled my buffer OVER the spring, to the back, so the spring is not prematurely compressed. The effect is similar and there is a reduction in recoil, but I haven't observed any FTE or FTFs. I think I may have installed my buffer "incorrectly", but the way I installed it, it still functions.