Regarding your surfing, I think your main issue is simply that you're too tense.
You hunch over and barely move until the end of the wave, when you stand up and relax.
Try doing that on the wave and you should find it much easier to compress and extend and twist back to the foam.
As for boards, fish tend to be fast, small wave boards, but they're wide, so don't turn as easily.
If you're in places where you get open Atlantic swells, there's more push, so you don't need the width and volume.
Check out what shops are offering rentals where you're going and see if they can recommend what's best.
Commented on Got a 2nd hand Seaside Firewire. Pret...
13 Oct 09:17
Your take off looks good, but then you're bending from the waist, instead of compressing and extending the front leg.
Try lifting your elbows to keep your back straight and stack over the front foot. Don't forget to bring your coffee cup arm forward so you're facing the nose of the board and your style should improve 👍