Finally...WIND!!!
Sometimes really constant wind, than gusty, but WIND!
I started with th 6.8 an Manta54. I could manage an average of 62,x and topspeeds of 64,x in between 1hour.
Then I changed to the Falcon Speed because I wanted to surf this board the first time, I have it since december but had not the possibility to surf it until now. Maybe 6.8 is not perfect for the board but okay.
After the last session I know can do runs around 65km/h with the 6.8 so a average around 65km/h should be possible.
And yes it was possibile, maybe the 6.2 had been better in some gusts, but I wanted to get the average with the 6.8, so I sticked on it.
The best runs showed even topspeeds of 70km/h are possible with this set.
PR for the 6.8 ;)