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Kisutch said..
I need to work on my staggered surf stance; it tires my back leg for some reason, so I'm in a narrow parallel stance when not paddling for a wave.
Yes, you should avoid putting your leg in constant tension, it can lead to injuries if you have to do a sudden effort on a tired muscle.
One trick is to paddle staggered, but switch foot (rear foot forward) on non-critical phases. You get stability, but it really relaxes the legs to alternate the efforts. The other is the one you are doing: adapting the longitudinal range of your stance to the situation: less for paddling around, more for water movements, whitewater, takeoffs.