I don’t know how much you’ve been eating, but I hope you’ve been eating to satiety and not to a calorie count. I realize you’re 9 weeks in and hopefully getting towards being fat-adapted. Since you’re feeling good and all that other great stuff, let’s assume you are! If you want to rev up your metabolism and lose weight, you have to be sure to eat enough to allow your body to release fat stores. I’m not familiar with the RER, but it sounds like maybe you need to do at least a little bit of exercise (maybe even just a leisurely walk sometime during the day would do it) in order to deplete your glycogen stores some more and get the fat percentage up. Maybe someone more familiar with these numbers will pipe in with something about that. The idea of keeping under 20 carbs is so you won’t have that as a fuel source, so I think 23% might be higher than you want.
EDIT: Right after I finished this, I decided to go see what I could learn about that RER. It actually looks like you are knocking it out of the park with that 77/23 ratio! THIS PAGE on Jonathan Jordan Fitness says 70/30 is a good solid ratio. So please disregard my advice about the walking, unless you just want to! LOL!
The macro calculators usually ask for your weight, age, BF%, and LBM and go from there to give you your macros. They also ask you to choose a deficit you want to meet by percentage (of calculated TDEE). Especially in these early weeks, don’t go too low! And if you find that you are hungry after a meal, eat fat to satiety (make some sweet or savory fat bombs and use them). Don’t let yourself go hungry or you will never get your satiety signals re-programmed. Even if you eat more at first and don’t lose as much weight, you’ll be better in the long run because your body will learn to tell you when you’re full and you’ll naturally eat less.
The one caveat I would add to eating to satiety is this: if you know you are a consistent overeater, then you have to figure out a method to help your body learn those satiety signals again. I still (after 9 months keto) eat to a reduced caloric level as a starting point, drink some extra water, tea, or coffee, wait 30 minutes, and if I still feel hungry, I’ll eat a little more fat and/or protein (I try to stay under my macro on protein). Again, drink, wait and eat more if I’m still hungry. Wait for the signals to hit. That might work for you, or you might try some other scheme. Just don’t let an overeating habit derail your system learning the signals again.
I hope this helps and I didn’t muddy the water.