Yesterday, I capsized twice (actually turtled ...) during the attempt to change my course from up- to downwinds. Wind was > 20kts with appropriate waves, we had jib, main sheet/ traveller/ cunningham fully open. Everything else was like upwinds. Everytime I tried to bear away, the boat accelerated frightingly and started to nose dive. What's the trick?

And, by the way, the mast of the Capricorn is 100% sealed - the boat rights itself from the turtled to the normal capsized position. No further action needed ...