I was getting slammed on my Wingfoil so busted ou the speed gear. Rigged 5.5 and tried out the 30cm Tectonics Falcon fin. The fin feels good and I did some sweet laydown gybes at the exit of the 'speed lane' until I hit the bottom! Then I had to wade thru mud up to my thighs to get back to shore! Maxed 30.01.