Super instable wind at first. Probably due to all the short rain and hail storms which made it pretty cold. And a few minutes later it was nice and sunny and warmer again. Later it became more stable, but not as strong anymore. 
Had to use a borrowed sail (with my own mast), due to a small repair in my own sail. Trim was way off with this one and I didn't dare to pull more downhaul, because it felt like way too much load on the ropes and mast. Felt like surfing with the brakes full on. All in all, a good session on Bitchlake.