I've been training for a long time and I've done lots of unilateral work with dumbells and the end result is my left arm is still a half inch smaller than the right one. I think maybe some people can balance them out but for others it's pretty much going to stay that way no matter what. It's really not too noticeable except to the trained eye.
Otherwise I'd just say try to make them both bigger and do lots of unilateral work to make sure the right arm is not doing too much and gets even further apart from the left one size wise.



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