Yea you would feel it, and since you have tried FCS glass on ect and it feels better you are not getting it.
The board would feel real loose and have no drive.
Does any other fin makers do fins for futures?

Have seen them in the shops, they got a good reveiw in ASL board test. They look well made.
I had a thought a few years ago when a shaper that I know well went from glass ons to FCS, he reconed that FCS was looser as the base of glassed fins didnt have the rovings and created a bit of cavitation, hence looser fin, I was thinking like a oring that fits around the base of the fin and shaped like a roving. Didnt get far with it tho.
Different people different strokes as far as this stuff goes but its interesting how different set ups work for people

Well fin positioning is a key, I have not been riding my favourite board for a few weeks all that well and it dawned on me, I slid it back on our trip to Bali. So I reset it back and what a difference,I was thinking wtf is going on with me ,my surfing has gone to the pack, well mac is back

mate I moved it back about 35mm and since coming home I have surfed like a dog sorry just a saying doggie The thing would not turn. From simple kickouts to smashing the lip,it all felt just wrong and weird.
Surfing in heavy traffic I was loosing waves pre take off because I didn't feel comfortable dodging five guy's. All good

happymac