h-drol could add some lbm to you but so could two 1000 calorie shakes a day, one in the morning and one after your workout, try it, thats my advise.
unreal is not trying to be a **** bro, but like unreal and I you are taller then some, and it makes it harder to gain weight to fill out your larger frame, but give it time and alot of food and you will grow.