My left pec is noticeably bigger than my right. I'm right handed, and my right tri and shoulder are stronger than my left, so I'm guessing my right arm is taking over when doing chest, preventing my right pec from getting worked as hard. My form is good, as I have my spotter keep an eye on it, and everything is even and balanced when doing reps. I'm thinking maybe I should pre exhaust my right tri and deltoid before working chest? Any ideas?