gandalf99 said..
Thanks for all the feedback. I ended up getting:
1. A 5.7 Hot Sails PW4. Huge boost but still felt I could do better.
2. Select 39cm carbon fin (instead of stock 32cm or 26cm wave fin). This really made a difference getting over the top when I was able to pump it close to planing.
With this setup (Exocet Cross 104 FSW) I am now planing around 15 knots, maybe closer to 16 (17-18 required with the 5.0). We've had lots of onshore days where I sailed right by our wind sensor (on the water), so I've been able to get a good gauge of the numbers required. I also found a scale and I am 75kg, not 72.
What year Exocet Cross? Just wondering if the recent years they have updated are slower to plane ae they made them more 'wavy'.
I've got the 2019 Carbon 94 and the largest sail I use on it is 6.5m with the original 30cm or 29cm Select Edge fin. I'm 78-80kg. Its got quite a long planing flat and no tail quick so gets going quickly.
I also had the 106 from 2008 and a 34cm freeride fin was fine with a 7m. I had a larger 36cm but it didnt need it.