The Woo is a great performance humbling device. For the short time it worked for me it certainly showed I plateaued my highest jumps between 10 and 12m.
Aside from technical improvements, you have to find your own optimal conditions/equipment combo. For me that's winds above 30 knots gusting 35 or more, a 7m kite and a small twin tip and launching either from waves or really flat water. Basically winds when you can ride fast even with the bar sheeted out.
The highest jumps recorded on the Woo scoreboard were all in winds above 30 knots and most of them launched from a wave as a kicker, which can make a huge difference.
The advice you got is great. The quickest way to improve your technique and give you more specific feed-back would be for you to record a few take-offs on camera and share it.
Most of the time jump height is limited from poor edging performance. The typical mistake being trying to go too fast and not being able to hold a strong enough and high enough edge angle.
Basically you have to be able to hold your edge as hard and as long as possible when you are sending the kite. The tiniest changes in your timing and edging performance have a direct influence on your height.
You can measure your edging performance by looking at the height of water you spray before take-off. The higher the spray, the stronger your edge hold is and the higher you will go. That being said, I find in very strong winds it's easier for me to get higher jumps by slowing down a bit which improves my edging. Yes, in theory, the faster you go the higher you'll jump but if you can't hold that edge, there is no point going too fast. It's all about
compromise.
When teaching students how to boost in high winds, I start by challenging them to boost as high as possible with as little speed as possible, this allows you focus on proper edging technique and aggressive kite sending. Even going close to half the speed you normally ride, you would be surprised how high you can jump in high winds with correct technique.
This is far from perfect technique but it's what my take-offs look like in my highest jumps in flat water (35-40 knots/7m kite). You can see in the center pic I'm loosing a lot of edge hold while the kite passes over 12. If I could have the same edge hold as the pic on the right during the sending of the kite I would gain much more height. Also I if could manage to hold that bar sheeted further in, the kite would be sent much faster with more power: much more height.
Christian