Back in the 70’s, W.A.V.E. SET had what they called a “finger fin” (or was it FINS UNLIMITED?). As the name suggests, very narrow, very short and very straight (no rake). Sorry, I can’t find any photo. That fin had no drive whatsoever but was very loose… You might make one like it.
You don’t say if you’re using side bites with the cut-away fin but, how’s about trying your cut-away without side bites and moving it up in the box a ways. Or, even try a shorter cut-away - say 6" - again, no side bites - but still toy with pushing it forward.
Check out: www.trueames.com for a good choice of other options. They make a very nice fin.
Cheyne’s Starfin is a must try in this board if it has a standard center fin box. A Greenough 4A is a good choice and depending on the demensions of the board of my templates the Mental at a about 7.75" would work quite well, if you can ever get any fins from the Halcyon shop.
Cheyne’s Starfin is a must try in this board if it has a standard center fin box. A Greenough 4A is a good choice and depending on the demensions of the board of my templates the Mental at a about 7.75" would work quite well, if you can ever get any fins from the Halcyon shop.