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wazza66 said..Front fins forward more will loosen the board up and allow you to surf with your backfoot not so far back when turning.
Front fins out wider and back will stiffen up the board and give it more drive.
Will need to get your back foot back a little further back when initiating you turns but should be quicker down the line.
Only real way to tell is to take a fin key out and swap fin positions whilst in the water.

Ya...swap Fins or adjust on the go..easy as..
Setup,
69SLAM boardies 4waystretch side pocket loop, hair tie - leash cord - hair tie - Hanalei fin key.
Remove from pocket loop, hair tie over hand holding key, swap for other side.
Can adjust single fin Hex screw.
Haven't - lost it or impaled myself.

Have - help'd lots of folk out back to enjoying the sesh
re broken leash cord, to remove a broken fin and/or remaining fin...
And a few hair ties to surf ladies after ugly wipeouts...
Good SUP PR

ENJOY