I'm not so sure plateaus are inevitable. It just becomes harder and harder to create a calorie deficit when you weigh less because your calorie needs are less.
I didn't change anything for the last 20 pounds or so because I was already around 1200 calories and 2 hours of exercise a day. So I just kept up the same old, same old and lost about 7 pounds each month at the end.
Robin, obviously what you're doing now works exceptionally well for you and I'm reluctant to have you change a thing! I know your calories are pretty low already so the only thing left to tweak for you would be exercise. If you wanted to, you could either add a little more OR make what you're doing already a little more intense. More time or more intensity.
But honestly, you may sail into goal just as smoothly as it's been going so far. So my advice is to just keep on doing what you've doing so well.