Done properly, you can easily sculpt nearly any muscle to achieve symmetry. It's not like you are going to wake up one morning with one giant lumpy pec. Go to P.M. and find BigA's syntherol protocols. Use this as a starting point. Each muscle group is well laid out and when followed correctly, would be difficult to mess up. It does take a commitment, but if you are serious, it is one of the best ways to achieve symmetry. I tore my already smaller left bicep tendon about 3 years ago. 1 year after I ran BigA's bicep protocol on both biceps, adding more oil to the left one to achieve symmetry. To this day, I gained a permanent 1.5 inches on my right and 2 1/4 inches on my left. I would do it again in a heart beat.