I Got Metabolic Testing Done Today!

Great job following the program then, and appears better than average.

In which case I'd suggest the whole period of what turns out to be eating so low - is likely causing a few reactions that typically occur in studies.

Your body is stressed out and cortisol is causing water to slowly but surely be retained - which can mask the fact fat loss is going on.

Of course a body that stressed out it reacts that way usually means other negative things are going on.

One, body responds by first slowing you down - not metabolism, but your daily burn, by you moving less. Not even step level moving, just extra movement, fidgeting, ect. Above metabolism burn can also be slowed down - hair/nail growth, skin replacement rate, ect.

So lets say the suggested REE was right on correct (if you exercise much though, or get more than 6K steps daily, you are well above), eventually smaller calorie burn actions are slowed down and you could lose 200-300 calories of daily burn that way - not really being in the deficit you'd think you are.
Workouts will many times also suffer - feels like pushing as hard, but that because it's with a tired body, there's not the same need for repair and elevated metabolism from it, besides not burning as much during the workout.

Combine that with stress water retained - totally hide the fact fat is slowly coming off still.

But it also means each binge day is pushing you more above a daily burn than other would occur otherwise.

So the idea of eating more to control the binges and sustain a reasonable deficit is great - allow body to likely speed back up, get back up to higher TDEE, and drop some stress water weight.

This is why refeeds and diet breaks has become more recognized as a very useful part of a diet.
First 2 pages of this topic have all the info you find useful on that.

https://community.myfitnesspal.com/en/discussion/10604863/of-refeeds-and-diet-breaks

Many will report eating just a tad more - 200-300 say, and losing weight.
Water weight, but then they keep losing and feel they have more energy. Yep, higher TDEE means the deficit is the same if not better - workouts are better, better body transformation, ect.
Reasonable rate is always better - now you have a better handle on what that number may mean.
Too many just say keeping eating less and less until body is just forced to drop the weight despite the above reactions, body getting in worse state from the stress. Fat can be lost that way, and other things.