Yehh.. Dont slouch while you fight unless it benefits the style that you already use..
But its best that if your a tall fighter..That you fight like a tall fighter..Stand up strait but still keep your hands tight and your elbows in.. Ive noticed alot of tall lads do stand tall but theyr defense is open..
The taller you stand the more you can pick your punches and keep distance.. and its alot harder to counter punch on tall lads..
Peace