You're not understanding this Lance. It is not unbalanced because SSJ 4 isn't part of the transformation set anymore. Weak transfromation sets reach x30 pl in their last transformation.
Better transformation sets reach x35 pl in their last transformation.
The last trans on saiyans' set is SSJ 3, which is at pl x35 and therefore even with the transformations system. SSJ 4 is somethign totally apart from basic transformations.