Understand right forearm takeaway and the 'fanning of the right forearm' that is part of the right forearm takeaway procedure. If that doesn't work as well as you would like, try to keep the right elbow 'nearby' the right rib cage, which is what helped me out quite a bit. For me, when I get laid off it's because I'm taking the hands/club too straight back. So by using a proper right forearm takeaway and then keeping the right elbow 'nearby' the right rib cage, that usually takes care of that.
Also, I've talked about using a camcorder almost every other practice session to make sure that I'm doing what Ted and I talked about in our last lesson (or I'm on the right path) and that I'm not developing any new, bad habits. But one of the things I love to do is go right to the range after the round.
I look at practice as like studying for a test. Then the round is an actual test (and a tournament round would be like a mid-term or final exam). In school, a good way to improve your knowledge is to take the test, then go over what you got right and what you got wrong and then work on what you got wrong. I think the same applies with golf. You've taken the test (the round of golf), now you should know what went right and what you got wrong and apply it to the range for some more 'studying.' And yes, do not be afraid to pull out the camcorder again. Clears up a lot of the fog.
Anyway, getting the right forearm on plane at address is only part of it for me. It's really the right forearm takeaway and right forearm tracing that gets me on track. Getting the right forearm on plane at address makes those things much easier to execute. So if you're only doing one and not the other, that may cause some difficulties.