I have the 2012 Varial X 12m and in 20 knots I have no problems with it as long as it is pumped good. I have felt a little wingtip flair when pushing 25 knots or if not enough pressure. I also have a 2013 Varial X 10m which got better. Still has to be pumped good but boy does this kite boost. I have ridden it gusting to 33 knots and solid 20-25 m jumps.
That's 75 feet off the water.
If you're pulling solid 75 foot jumps, please film them and post them on Youtube...they will be very popular videos.