Woah those are a trip! Gonna start with Machado keels cuz that's the most neutral keel template I've got. I've got other template with more/less depth/flex/rake but honestly, at least from looking at it, keels feel big back there. May even just go some Quad fronts and trust in the rail. Tried a bunch of fins visually with the kid at the shop and his vote was the EN Twins. They do look pretty nice, neutral upright and super stiff, he may have something there. Gotta surf it first to see which direction to goSunrise Boardworks makes some crazy flex twin set ups that would be interesting. They are on a smaller scale operation so Not sure on production or stock. But worth a look. I only know his instagram handle @sunrise_boardworks