When the wind speed changes, it becomes suddenly difficult for me to jibe.

[@steeehl]

It looks like you have difficulties when you're faster than the wind during the jibe. In that case the wind comes from the front and shifting the sail means pushing the sail through the wind. Not much you can do about it besides being prepared for it. Duckjibing could help but with a sail that size ... :-(

[@kawakappa8252]

It seems better to read the wind and choose the place to do JIBE. Thank you for your advice.