I am a pretty new to this forum, hopefully the knowledged ones can give me some good advice. I am 26, 6' currently weight 155lbs, been working out on and off but been serious in the past 2 month and I have some really good gained by eating right and workout hard with plenty of rest. However I discovered dispite of my growth my left pec is bigger (not a huge amount but noticable) than the left. here is what i do for chest:

cable cross over
flat bench (smith and dumbell)
incline flat bench (smith and dumbell)
chin ups

any suggestion how to fix this? I don't want to end up looking unbalanced.

Help !!!!