There's definitely some give and take on length and volume. The trend over the last decade has been to make rounder, shorter boats with more rocker. Sub 80 gallon creek boats. Now we see the trend shifting back to longer profiles, with more volume, and a different distribution of volume. The newer creek boats with greater volume paddle amazingly and offer a completely different ride than their smaller counterparts. At 5'9" and 170lbs, I paddle both the Medium and Large Bazooka and use each under different circumstances.
The only way to know is to test...and don't ever discredit until you put some miles under you.
The Bazooka series has been awesome. It's fast, responsive, has edges when you need it, and is exceptionally forgiving.
To air is human, to get big air divine.