at that height it is hard to add mass as your leverage is bad for many lifts such as squat,overhead press, curls Im 6'1 and face the same problem to a less degree. It also common knowledge taller people genraly need higher doses
what u on about, youd be hard pressed to find a strong man under 6ft? most wsm are 6'4 ish...
im 6'1 too, ive never thought its a disadvantage in anyway, altho can be competitive wise