Floppy fin is exactly what it felt like on the FW.I use the wood rails on my longboars. The springback is noticeable. To me it's not so much of a delay, like a floppy fin, it's the extra projection you may not be ready for. First wave, on the first boar, first bottom turn, the boar accelerated and left me in the trough, with a "wow" feeling.
We’re all looking for that “wow” feeling in boars, fins, waves and leash strings apparently.