try simple single factor training bud.
using deads and squats as andy says..
adding weight on a consistent basis will be the shock youre muscles deserve.
as you approach your PB drop the increments to as low as 1kg.
if youre diet is good and youre getting enuff REST youre body will adapt to the small weight increments for far longer than trying to add what most gyms have as a minimum weight increment ie 2x1.25kg plates.
this has been one of the biggest facotrs in my progress.

natural or enhanced the principles are the same.

get big first then fcuk about with isolations when you need to shape the muscle.