WHATS MY VOLUME?
The above is a basic guide to preferred volumes. This of course relates to your fitness , frequency of surfing and conditions. If you are surfing waves that have a lower level of saltily or slower weaker waves , like wind swells slightly more volume would be needed. The below case is a good example of fitness , inconsistency of surfing and ability level.
A is looking for more perform out of his boards while B is looking for paddle power and ease. For B to get more performance out of his boards the smaller shorter models would be a great option...More paddle in a shorter rail line which will make a higher volume board more lively under your feet.
DOES THE OUTLINE EFFECT THE VOLUME.
The outline will effect the paddle power of the board... Even though the GHERKIN is so short , the straight rail and the extra surface area helps maintain the boards momentum on and off the wave. So it is possible that sometimes a lower volume board will paddle better than a higher volume board depending on this over all outline. Also the dimensions can have different volumes related to the shape.