I always work from top to bottom, begin and end on the same panel. I always start on the passenger side front fender, then work my way around the drivers side ending at the panel I started with. Don't ask me why I start there...just always have. Whether I'm removing wax, laying on wax, buffing, or claying...the path is the same.
I think that's the key. Create your path and repeat it till it's become habit. All my guys always ask me why I start there every time...I never have an answer. But now I notice them doing it, cause just like you...I always catch their misses, ha. I think in the back of my head I just like to get the front done first.