@TomW
quite surprised about what you report.
Did you ride both wings during the same session? As different days, different conditions can make a big difference regarding personal impressions.
My impressions are a bit different:
548/330 way slower than 550/330 (or /325), more lift, easier to ride slow and take-off slower
550 (/330 or/325) quite a bit faster which makes it better for light winds (when you can handle the acceleration and speed advantage directly when get going and take-off)
560 (or new version of it: 558) /330 is my personal go to wing when not in 100% race mode, does everything really well. A bit more speed oriented than 550.
600/380 pure race performance - very well balanced
Cheers,
Frank
www.famousfrank.com/hydrofoil/moses