Inequal muscle developement?

[nop]

Ive been working out the past few months, and my pecs are noticably firmer and larger, but my left pec doesnt seem to be advancing at the same rate as the right one.  The top part of the pec in particular is very undeveloped compared to the right side's.  Its not noticable to the eye as far as I can tell but I can definately feel the difference.  Anything that can help?

[moobius]

use dumbells instead of barbells when working bench. that way you're not compensating for one side or the other and are forcing each side to do its' own work.

besides that, it's probably only noticable to you. perfect symetry is a very rare thing