Do barbell exercises. You should be doing them anyway. They'll automatically correct asymmetries.
Also, there's no good reason to EVER do more than 12 reps per set. 8-10 for hypertrophy (i.e. muscle growth) and 3-5 for strength is a good rule of thumb.
_________________
In my darkest moment fetal and weeping,
the moon tells me your secret; my confidant:
"As full and bright as I am,this light is not my own.
The source is bright and endless.
She resuscitates the hopeless.
Without her we are lifeless satellites.&a