at 6'3 extrapolating from myself at 6.1 your ideal weight is between 190 and 200thats 20 or so lbs of weight loss for you
the bmi works across physiques. Models, Fighters, Weight Lifters.Sure it gets throwed off a bit if a woman has extra large boobs, an oversized butt or if a guy is top heavy. Its not perfect but its a damn good guide.