NK,
Please engage a few regattas with the F17 racing against a top fleet and tell me what you come up with. It sounds like you sail a F18 in EU where the F17 sailors are way behind in techniques. They will catch up quicker if they read certain posts on this forum.
Let us know what races you plan to attend and provide pics please! Besides,
Q: if it's faster then why isn't the USA fleet doing it?
A: It's because we tested and saw the light years ago. And that's why we post here; to share the knowledge.
Have a nice day,
Bob