As I had this talk about BMR with you, here is my answer.
You are over complicating things.
How long has it stalled? 2-3 weeks? or 2-3 days? 2-3 months?
If you have stalled and your strength is still there, lower the calories. SLOWLY. start with 200 calories.
If you have stalled and your strength is gone (or you are irritable, extra tired, cranky), up the calories a bit or take two days off in a row and eat.
Also, write down what you are eating in a day, and post it here, noting the time.
We await your post.