How to fix asymmetrical sides after a men's fade haircut?

Let me share a down-to-earth experience. During an afternoon shift at the barbershop, a client getting a skin fade looked in the mirror and felt one fade line was higher than the other. Pushing it up further risked making the whole haircut too short. The situation wasn't out of control at the time, but dragging it out would definitely have damaged the client's trust. I first performed minimal…