the fin goes with the sail
no weeds - don't bother with the weed fin
you are not gonna be wave sailing nor sliding the back of the board in jibes
personally i would go with the supplied JP 42 fin
this s/b good up to 8.x if necessary
also, if wind is good - raise the keel and fly :-)
just my 2 cents/ make sense ??
joewindsurfer.com