Futures Single Center Fin For Flatwater

[Slappysan]

I just picked up a Uli GL 10-0 Special Edition primarily for surfing but I was wondering if there are any decent options for better tracking fins for it for flat water. Obviously there are massive options for longboard fins but I need to find a Futrues.

[Sup-position]

These Two are cheap and popular....

Keel 44.4
Triangle 43.5

[Slappysan]

Those both appear to be for longboard fin boxes, my center rear uses a thruster grub screw though.

[Slappysan]

Looking around the best looking fin I could find would be getting a set of Solus and just using the center for flats. This would be good as I'm usually surfing small waves and need the speed these will give when using all 3.

https://futuresfins.com/en-us/solus-solus-1400-430-00-detail

Any thoughts or other options? Too bad Uli didn't have a longboard finbox for the center.

ps. You can't see it on that page but the Solus center is a hatchet.