Had another session yesterday, similar conditions, except much flatter water. This time I tried hard to keep an eye on the key things mentioned in this thread. I always thought that when railing the board I put my back foot just behind the leeward front foot strap. It turns out it wasn't even close. It actually was closer to the back foot strap. More forward foot placement was very helpful with carving the board. Also was going much faster into the gybes, the sail did not feel powered at all except close to the very end when it was time to flip the sail anyway. Managed to only fail about 3-4 gybes out of ~30. So, much happier session this time

Also +1 for the tip to push down on the boom. Never used this trick before, turns out it helps a lot to keep the board stable