Long Board Fin

Hi all am prity new to long boarding, purchased one about 6 months ago and I love it, i tend to swap between me short board and then to a long board when i need a confidense bost / long ride.
Any way it came with the cheap plastic fins, so am looking at purchasing a glass one. been looking a at mishue dolphine fin for a general all rounder can any one give me any advise?
My board is 9' x 22 3/4" x 2 3/4" single vee to double concave at the fin can any one advise should i get a 9" to match the board length?
I like to ride it fast down the line with big fast sweeping turns - wicked
Its also got the FCS fin slots for thruster set up - never used this whats it for / like
Any advise would be appreciated
Any way it came with the cheap plastic fins, so am looking at purchasing a glass one. been looking a at mishue dolphine fin for a general all rounder can any one give me any advise?
My board is 9' x 22 3/4" x 2 3/4" single vee to double concave at the fin can any one advise should i get a 9" to match the board length?
I like to ride it fast down the line with big fast sweeping turns - wicked
Its also got the FCS fin slots for thruster set up - never used this whats it for / like
Any advise would be appreciated