Bufff, that took many attempts, and even still B fell partially on the win, but did trigger it. Spoiler: Easier way Sent B to the ball, and quickly push it away so B stands in front of the traggable. Push B quite hard towards the win. He'll fly across the level. It's easier than the jumps.
Thank you for comment @Block builder @gmacpro ! Enjoy this for a relaxation from my others complex puzzle Spoiler or maybe more stress.
Nice jump technique although second one was really complex. Just after tens of tries B touched the win once. Thanks!