Depending on the deepness of your hull, you also might want to look at the 4c. Less base area, so it might go better in transition back & forth across that hull.
if you are making a stub hull you will want use a flex fin the greenough fins are to stiff and won’t give you that loaded up twang out of turns that you want on hulls just my opinion.
The new volan Liddle fins from Aims are REALLY nice. Greg and Chuck have been workin on this for a while, the fins flex more evenly, not just at the tip. By the way when checkin a fins flex DONT grab it crank on it with your thumb as hard as you can, it dosnt help the life of the fin.
well,you can use that 9" 4a.it will provide heaps of drive.problem is the ones ames make aren’t quite thick enough or foiled right.remember, th fin on greenoughs spoon was a good 10" but it was thicker and foiled a little different.that fin worked, in part,because of the hull depth. inkow PG made a 6’ deep-hulled greenough type hull stand up board and i believe it crancked using a 9.75 4a fin…best thing is to get a 4a, 4c and an l-flex-all 9" and play around with them. you will learn a lot that way…
nice looking board get the fin that you think you might like and as you ride the board more refoil it ever so slightly till you find the feel you want fins are not some voodoo art they require constant fine tuning to get a new feel as they change due to constant stress.my personal thoughts are if you can shape that nice complete the package a make your own fins aloha…
I rode that fin for the first time yesterday in my light weight hp singlefin and really liked it. Engaging early and finishing longer than my usual stiffies. The low tide peelers that were a perfect fit. Try it, and others, life’s simple pleasures!