Being relatively new to the sport, I have had (to be honest, still have
sometimes) problems with overpowered situation, including violent/washing machine style wipeouts. The funny thing is you don't realy need to be that much overpowered windwise with regards to you kite size - it was happening to me also in quite barable wind conditions: my board was just going faster and faster, me overtaking the kite which was pushed more and more into the powerzone, ....
First of all, the normal beginner-type of reaction was to bring the kite to the zenith - it helped (but not always!) to avoid wipeout, but at the HUGE
price of 30 or even more precious height meters.
"I must be doing something wrong", so I asked experienced guys on kiteforum.com. "Keep the kite low and edge hard" was the answer. With all the respect guys, this solution NEVER helped me to avoid the wipeout - the kite just did not want to go furher in the window and I was loosing the edge to beeing thrown board-sideways as well. (Don't get me wrong: I still belive you guys this helps, but it just did not help me).
Lately, I am using the following technique: when I feel the "wipeout ending story begins", I sloooooowwwwllllyyy bring the kite towards the zenith, but not completly: I usually stop it at around eleven/one'o clock so it still keeps me going forward. While in the proces of bringing the kite above me it naturally wants to lift me up... BUT, for me this is a perfect oportunity to lean extremly backwards and dig my edges into the water - usually this will blast me upwind (take the word "blast" relatively to my greenhorness
and very quicky kill my speed - sometimes so quickly I would need to dive the kite again and relase on my edge a little bit not to fall backwards.
For all the beginners out there: try this as well, since I am wipeing out now less frequently than I used to while keeping the kite low.
(As somebody on this forum already suggested, I ride quite a big board too (184cm) - I am in a process of buying a sgorter one and I will post my experience in wipeingout with shorter board).