I read too much, too, Karin.
One think I'm pondering. Not a refeed so much (although maybe that's what it is), but a bit of calorie cycling. A few days around 1,000 (this would be a bit low for you) and then a few days at 1300 or 1400. It seems like consistency - regardless of the level - my body adapts. When I did WW years ago (eons, I feel like), I naturally did this, and it worked like a charm. I basically added up my points for the week and treated each week as a bank. I used every point, but usually used a big chunk over the weekend and then had a couple of really low days (especially right before the weekly weigh in, though it consistently went down, so I know I was doing something right).