I get that this is a high protein diet, but what about veggies and carbs? Honestly that does not sound healthy. Your body sounds like it is in starvation mode and you are just metabolizing your muscle. You have gotten a lot of suggestions but you might be too fixated on your butt fat to put them into place.
I'll keep trying things but I can't drop cals by another 500. I have slowly reduced cals to the diet example above. I did it by reducing carbs. The diet above gives me 80g of carbs a day.