i lost over 90 pounds this year.
we are the same height.
I am 78.5kg currently.. which is around your current weight, my starting weight was 121kg, which is around 19.1 stone/267 pounds.
Anyways, everyones body is different.. i don't listen to bmr, everyones metabolism is different.. from experience, i would say 1400 calories for you is perfectly fine.
My goal is 120ish lbs, since we have around the same amount to lose, if you'd like to message me via this and we can help eachother i'm open to that too!