And I also agree, getting BMR from using BMI is faulty. It would seem the only true way of accurately getting a BMI is from a DEXA scan, or from hydrostatic weighing, but really who is going to shell out the money to do that? So basically it's like anything else, you use BMI to get an "average" of what you should be consuming and from there you may have to tinker around to find the best macros and caloric intake to get the results that you want.
I noticed that my lifting suffers while I am in ketosis. Probably because I don't have the glycogen reserves in my muscles.