Honestly, if you're concerned with imbalances, do some unilateral work. Something like a lunge for the lower body. Can't think of a way to go unilateral with a barbell for the upper body at the moment, but I'm sure there are ways. There's always going to be a slight imbalance in strength/appearance. You're not stepping onstage at Mr. O, so symmetry isn't a huge issue for you at this point. If an imbalance starts to cause nagging pains or makes your form look dangerous, then yeah, time to fix it. But that could take awhile.