thats a loaded question. gear doesnt make you put on muscle. your diet puts on muscle.
your training puts on muscle.
your dedication puts on muscle.
etc
dealing with sides have to be taken into consideration. example if 750mg starts to give you gyno and you go overboard on an anti e you will have less gains than a side free 500mg
if 750 shuts you down hard and screws up your pct you will lose more muscle and not benefit as much as from a 500mg
if you constantly up your dosages down the road you will run into huge problems.
id run 500mg at least once more then think about upping the dosage or stacking.