Just for fun, here are the fins I run on my boards:
- Angulo Shaka XLT (14' x 30") downwind board - Allison Ninja works great for me. A really good downwind fin that also tracks well. If it's really flat, I will use the Allison Thresher.
- Bark Custom Unlimited (18'6" x 27"). This board is lightning fast but very tippy for me when going slow. It gets more stable when going fast or with the wind at my back. Interestingly, it feels very stable when going downwind in light or moderate wind. I have not had it out in really windy conditions yet. On this board, I am running a HUGE Jimmy Lewis fin that was modified to fin the small fin box. This fin helps stability and tracks great. I also have an Allison Gladiator that I will go back to once I get more water time on this board. It feels faster and has more rake.