I (JB) tend to challenge the claims of lack of power in the Naish Wing-Surfer. I am 88-90kg at the moment, and 6'2". There is not many crew that get going earlier than me. I use a 1240 HA foil on my Hover 110 CU.
Foiling is such an interesting game. I find the same issues come up with Windsurf Foiling also. I find if you can be efficient, smaller is better. This does take time, but the benefits later on are worth the extra work. I use the same size wing and foil from 8kn - 40kn. Same board, all rigged the same. This is pretty extraordinary!!
Here is a quick video from Saturday when the NE'er didn't properly come in. BOM gave the obs at 7-13kn. I was on my Hover 110 CU with hte 1240 HA Jet and the 4m Wing-Surfer.
You can most definitely go a bigger wing and a larger foil, and it might pop you up a little earlier with less effort. But once you're up, the excess wing and drag of a big foil will restrict manouvderability and speed.
I am excited to get on a bigger wing soon, but I am more excited to get on a smaller one. Lighter, faster and more manoeuvrable.
Enjoy the journey, it's soo much fun.
Ride safe,
JB