which fin should i choose?

Some?? All!

The Azul or the Rake made by Rainbow fins would work well in your board. 8 1/2" or 9" will do the trick. Excellent all-around performance. For flex the the Andrenni fins have excellent tip flex and holding power. Rainbow made in the USA and family owned. I always thought the Greenough fin would have been a better fin with more rake. Too vertical. I’ve been using raked fins for years in 9’0 plus longboards that turn on a dime and noseride too. The Calif Rake that True Ames does is a winner and so is the Bahne/Fins Unlimited Rake. Of course if you want a one trick pony nose rider; go to something with a wider base and a fuller outline like Rainbow’s “Fringe”. Lowel