Hey Jon,
Good question this can be a tricky ball to return on the backhand side. It’s important to go forward on your stroke otherwise the sidespin will bring the ball out. Have you seen these 2 videos?
1) The differences in returning sidespin/topspin, sidespin/backhand serves: https://tabletennisdailyacademy.com/videos/the-differences-in-returning-side-topspin-and-side-backspin-serves/
2) How to return long tricky side spin serves: https://tabletennisdailyacademy.com/videos/return-tricky-long-sidespin-serves/
In these two videos we highlight the backhand technique and what to do. Does this help?
Dan
