this ones the fin set up on my 9 foot 6 original gun

8 inch 6 centre oceancritter dolphin fin , 4 inch GLX side bites

am thinking too much centre fin for me , this board is for my shortboard type longboard so want to be able to throw it around ,thinking of going with quads with a nubster or a thruster setup

I've got an 8' minimal thruster that I want to but a finbox in so I can ride it as a single fin, to make things easier I was thinking of leaving the fcs plugs in it a putting the finbox right in front fcs plug which would make the rear of the single fin 8" from the tail of the board, do you recon it will be to far forward ?
I was thinking I might be able to get away with it or should I go to the extra trouble of taking out the fcs plugs ?