Still in the beginner-intermediate phase, but after just 15 minutes mucking about on a phat surf foil it is obvious your need three foils; a) phat one for waves and under 15kts, medium like a Carver (I have one, and love it) for 14-18kts, and a faster blade for above 18-20kts (like my Black and White). That said,. I think I'm just going to get a 3.5m kite so I can go on to waves with a phattie at 20kts-plus too. I use my 5m at 18kts, and it peaks at 22kts ...

.