Great response Colleen. Its good practice to be comfortable on different parts of the board. Just like SUP, when you observe the water forward of you is becoming steeper one naturally adjusts, typically bringing the back foot closer to the tail. Same concept with paddleboard, moving aft will spare the paddler from the giant splash and subsequent pearl of the nose. Continuing your forward momentum. Like Colleen I also find myself doing this continually during good downwind days.
I find the most efficient way to make this adjustment is getting into a plank position with hands firmly planted on the rails, toes tucked on the board, just like a push up and scooting back swiftly. Once the moment has passed that you risked pearling, getting splashed and losing the glide, utilize the same movement to get back into the sweet spot.
We all make small adjustment consistently no matter what the conditions are like, the only difference is this technique is done WHILE on a glide and will take some practice. Practice in flat water. Moving forward and back. Prone to knees. Paddleboard burpees!
Aloha & Have Fun