This is one of my pet peeves of riders who always ride one handed. If you want to ride better, ride with 2 hands on the bar. You will ride better if riding with both hands on the bar most of the time. Trust me.
Let me explain. Riding one handed opens up your body to the direction you are going and it also let's you sheet out more because your shoulders just opened up, so the bar will be further away. So you end up riding too much upwind and slower.
If you put 2 hands on the bar, you'll ride a little more square and faster and learn to go upwind more with edging instead of just relying on the depower of the kite.
The only time I take my hand off the bar is if it's so overpowering that I have to slow down and just muddle upwind. Otherwise, both hands on the bar and I work on my stance, edging, etc. to get upwind.
Hope this helps,
Bob
www.kiteridersllc.com