I've been helping a few people thru email (won't name them) and I'm surprised that some things just don't work for someone unless they practice it over and over for hours and even then it's just a little better than before but at least then they know it's possible.
I tricked this guy into making PR work for him by faking him out. I said "ALright, so PR doesn't work, who cares. Use it as a way of studying instead of as a magic wand." I had him first PRing with no preview, then rapid reading the whole thing at Mach5 and finally using SR/Dipping as a way to reviewing/studying instead of as a way of reading and he's happy as hell. He marks the margin where he doesn't understand something the first time thru so he can come back and dip into it. Then I said "you know, you can switch between RR and SR/Dip all the way thru the book" so then he did that and eventually just started flying.