Don, I have cheated on a couple, but I prefer to get them as straight as possible. Heating right before the hook is the best spot.
I secure my bow side ways on my bench. I put a weight on the very tip attached to a string, so when I heat it up it'll bend the right way. I put something to stop it from going too far, a little block of wood or something.
I've had real good luck doing this, and now do it on almost every recurve, even if they're out just a bit. They won't move through out tillering, because this area is usually left a little stiff as to not lose your hook.