Hi Childsplay,
I have tried a couple of fins in my 2014 Falcon (24.75") and am extremely happy with my current set up!
I was using the stock ONE fin for ages in my board, I also had a few incidents with weed on the flat water but it is a capable DW fin for the ocean, very stable, a pretty good stock fin IMO.
I then started using a Futures Fins Triangle Cutaway Race in the small (44 sq. in.) size for flat water racing, this fin was really fast and had no issues with weed, but it did hold the back of the board a little too straight when in some of the stronger side wind causing the nose to turn DW. The large sweep and amount of fin area deep in the water made it harder to pivot turn than the ONE fin, but it worked well, another good fin.
The favourite has been the new Mako fin from VMG blades (
www.facebook.com/VMGBlades). This fin has a great foil profile for the speeds that we do on SUPs and doesn't have too much fin area deep in the water. I am not sure of the actual area of the fin, but I think it would be a little smaller that the ONE. In the flat water I have not noticed any difference in speed from the Furutes Fin, but the distribution of the fin area in the water allows the board to "drift" a little at the rear when there is a side wind. This keeps the board pointed in the direction you want to go and enables you to swap paddling sides more often than when you are fighting to keep the nose straight. There is a great rake at the base of the fin, different to the "corner" at the base of the ONE fin, so I have never had any problems with weed using it. Wait... I haven't even got to the best part about the Mako yet... that is how it performs DW! It is a little less stable in the ocean than the ONE fin, but it is worth it once you have a little experience. The foil on the fin works a treat to help the board turn and foot steer on runners, much easier to turn than the ONE. Again that smaller area deep in the water seems to make the board "drift" or traverse across runners much better, some fins hold the back too tight and slide the nose into the trough, but the Mako really helps to hold the line and keep you making ground in the direction you need to go. Made me faster DW! It is also ultra light, not much to dislike about the fin really, unless you don't like the look of sweet carbon fiber weave!
As you can see I am pretty happy with the Mako and I have only had it a couple of weeks! I have tried it in a few 12'6" boards as well and it really livens up how they behave off the foot, surf really well!
Hope this helps shed some info on a cool new fin out there. Just try as many as you can and get what works for you.
Have fun, paddle hard!
I am 177 cm, 75 kg and not sponsored.