Understand your dilemma fully.
I use an 11m2 kite for light wind waveriding (and earlier also a 13m2 but have dropped that one now).
Using a high depower fast turning kite (a wavekite) for this.
(Fortunately these kites also work excellent for hydrofoilboarding, except for marginal winds, but that is another topic)
If the wind is steady and waves small, I sometimes used a non-depower powerful 10m2 instead, but has dropped this one too now, and use the 11m2 instead as it covers so much more
Takoon Furia is my choice, and have been ever since the first one came years ago (now it is 5th generation Furia).
Turns really fast, has huge depower and range, and can be controlled with one hand if you like - and this is what it is all about
Of course, I use to say "In light wind does the kite almost not matter at all and everything works for waveriding". Still true.
But if bigger waves (=more apparent wind) or gusty/changing wind, a real wavekite (high depower gust absorbing fast turning) works much better also in big sizes IMO.
Not used as much as the smaller kites (a 7m2 is typical for waveriding for me at 77kg), but sometimes it is great when the conditions are there, and a 9 just wont make it
I simply hate low end delta like kites that pulls a lot and sits deep, for waveriding, but that is me I know.
If you are heavy, these kites works better, but when light or medium, I find these a no no
Peter